PLASTICIZER DOTP

CAS Number: 6422-86-2.
EC Number: 229-176-9.
Molecular Formula: C24H38O4.
Molecular Weight: Approximately 390.56 g/mol.
INCI Name: Not established here for the supplied industrial plasticizer grade; an INCI designation must be checked separately if cosmetic use is proposed.
E Number / INS Number: Not applicable; DOTP is not identified here as an approved food additive.
Boiling Point: Representative value approximately 375 °C at 101.325 kPa in a published product SDS; literature values around 383 °C also occur.
Melting Point: Approximately -48 °C is reported for the chemical in reference literature; a published commercial DOTP grade lists a pour point below -45 °C, which is a different measurement.
Viscosity: Representative dynamic viscosity 65.8 mPa·s at 25 °C in one published product SDS; another commercial technical data sheet reports 86 mPa·s at 20 °C.
Density: Representative 0.982 g/cm3 at 20 °C in a published technical data sheet; a commercial specification lists specific gravity 0.983-0.989 at 20/20 °C.

Identity note: DOTP, often called DEHT, is the para-substituted terephthalate isomer and must not be confused with DEHP / DOP, the ortho-substituted phthalate isomer (CAS 117-81-7). Both compounds have the same elemental formula and molecular mass but a different arrangement of the ester groups on the aromatic ring.

COMMON PRODUCT AND CHEMICAL NAMES

Dioctyl terephthalate
DOTP
Di(2-ethylhexyl) terephthalate
Bis(2-ethylhexyl) terephthalate
Di-2-ethylhexyl terephthalate
Diethylhexyl terephthalate
DEHT
DEHTP (alternative abbreviation)
Terephthalic acid, bis(2-ethylhexyl) ester
1,4-Benzenedicarboxylic acid, bis(2-ethylhexyl) ester
Bis(2-ethylhexyl) benzene-1,4-dicarboxylate

The commercial expression “non-phthalate” normally means that DOTP is not one of the conventional ortho-phthalate esters. The trade descriptor “dioctyl” refers in this case to branched 2-ethylhexyl chains and should not be read as proof that the ester is made from linear n-octanol. DOP / DEHP is not a DOTP synonym.

WHAT IS PLASTICIZER DOTP?

Plasticizer DOTP is an external plasticizer used in polymer formulations, especially polyvinyl chloride (PVC). An external plasticizer is a low-molecular-weight substance physically mixed with a polymer; unlike a covalently incorporated comonomer, it normally remains a distinct mobile component within the final material. This difference is central to product performance because plasticizer content affects softness and flexibility, while diffusion and extraction remain possible over time.

Rigid PVC is useful in pipes, profiles and other relatively stiff articles, but many applications require a material that can bend, stretch or remain pliable in cold conditions. DOTP facilitates these properties when it is dispersed through the resin during compounding or when PVC paste particles are sufficiently fused during plastisol processing. It is used in both homopolymer and certain copolymer vinyl formulations, subject to resin compatibility and processing trials.

The liquid form of Plasticizer DOTP is generally colorless or pale and mildly odorous. It is not a polymer, a surfactant for aqueous detergency, an epoxy resin hardener, or a reactive acrylate diluent. Adding DOTP to a formulation is not equivalent to adding a chemical crosslinker: its main role is physical modification of the polymer's mechanical and processing behavior.

The exact composition of a commercial grade matters. A high ester-content product can still differ from another in acid value, residual water, color, trace impurities, storage history and shipment handling. Therefore, the generic term Plasticizer DOTP identifies the chemical, whereas a specific sales grade is defined by its supplier's current technical specification and batch documentation.

The term “non-ortho-phthalate” is more chemically precise than implying DOTP bears no relationship to aromatic dicarboxylate esters. The terephthalate group occupies the 1,4 positions of the aromatic ring; DEHP occupies the 1,2 positions. Regulatory treatment follows the exact chemical identity, not only the similarity of a marketing abbreviation.

CAS NUMBER, EC / EINECS NUMBER AND CHEMICAL IDENTIFICATION

Product Name: Plasticizer DOTP.
Chemical Identity: Bis(2-ethylhexyl) terephthalate.
CAS Number: 6422-86-2.
EC / EINECS Number: 229-176-9.
Molecular Formula: C24H38O4.
Molar Mass: 390.56 g/mol (approximately 391 g/mol when rounded).
Chemical Family: Aromatic dicarboxylic acid diester; terephthalate ester; external PVC plasticizer.
Principal Alcohol Moiety: 2-Ethylhexyl.
Principal Acid Moiety: Terephthalic acid / benzene-1,4-dicarboxylic acid.
Normal Physical Form: Liquid at ordinary room temperature.
Ordinary Appearance: Clear, nearly colorless oily liquid.
Primary Functional Role: Plasticizing flexible vinyl polymers.
Distinct Ortho-Phthalate Isomer: DEHP, CAS 117-81-7; not the same chemical.

The CAS number applies to the defined terephthalate substance. It does not automatically describe all possible blended plasticizer mixtures, recycled-material compositions, or formulated liquids that happen to be sold for similar uses. Purchasing specifications should therefore distinguish neat DOTP from DOTP-containing blends.

Both DOTP and DEHP have the molecular formula C24H38O4. A label displaying only “dioctyl ester” or the molecular formula is insufficient for identification because positional isomers require separate registry identifiers. Consistent identification through the CAS number, chemical name, supplier SDS and appropriate analytical method is particularly important when replacing restricted substances or supplying audited industries.

The exact spelling of the systematic name can vary slightly across regulatory registries. “Bis(2-ethylhexyl) benzene-1,4-dicarboxylate” and “terephthalic acid, bis(2-ethylhexyl) ester” represent the same DOTP structure; names containing “benzene-1,2-dicarboxylate” instead indicate the ortho-phthalate arrangement and should trigger an identity check.

CHEMICAL STRUCTURE AND MOLECULAR CHARACTERISTICS

The molecular framework consists of a six-membered aromatic ring substituted at two opposite positions by carboxylate ester groups. Each ester oxygen is bonded to a branched 2-ethylhexyl group. The result is a molecule combining polar carbonyl-containing regions with two comparatively large hydrocarbon chains.

These contrasting features help explain DOTP's affinity for vinyl resin. The ester groups interact favorably with the polar character associated with PVC's carbon-chlorine bonds, while the hydrocarbon groups support mobility and reduce the ability of adjacent PVC chains to associate closely. This description is a polymer-physics interpretation of plasticization, not a claim that each DOTP molecule makes a permanent stoichiometric bond with a specific repeat unit.

The symmetrical para arrangement differs from the adjacent ortho substituents in DEHP. Positional isomerism can modify intermolecular packing, compatibility, physical properties, extraction behavior, and biological processing. Structural resemblance is therefore not sufficient evidence that performance or toxicological classifications are interchangeable.

The two ester functionalities do not make DOTP an acrylate monomer or an epoxy curing agent. Under normal PVC compounding conditions it is not intended to polymerize into the matrix. Excessive processing severity, incompatible additives, contamination and long service exposure can nevertheless affect the stability of the overall formulation, so performance tests should not be bypassed.

DOTP is hydrophobic and has very limited affinity for bulk water compared with water-soluble glycols. Its low water solubility makes it an unsuitable candidate for direct preparation of an ordinary aqueous solution, although it may be incorporated into emulsions or mixed systems using appropriate formulation technology. The pure liquid's chemical properties cannot be applied unchanged to such emulsions.

PHYSICAL AND CHEMICAL PROPERTIES

The values below are examples from published technical documentation for representative commercial DOTP material. They must not be interpreted as a guaranteed specification for every offered grade or shipment; properties measured under different conditions or by different laboratories are not necessarily identical.

Molecular Formula: C24H38O4.
Molecular Weight: Approximately 390.56 g/mol.
Appearance: Colorless to pale, clear, oily liquid; grade dependent.
Odor: Almost odorless or mild characteristic odor, depending on grade.
Specific Gravity at 20/20 °C: Representative commercial specification 0.983-0.989, ASTM D4052.
Specific Gravity at 25/25 °C: Representative commercial specification 0.980-0.987, ASTM D4052.
Density at 20 °C: Representative technical-data value 0.982 g/cm3.
Dynamic Viscosity at -20 °C: 2,880 mPa·s, one published temperature series.
Dynamic Viscosity at -10 °C: 961 mPa·s, same series.
Dynamic Viscosity at 0 °C: 377 mPa·s, same series.
Dynamic Viscosity at 10 °C: 170 mPa·s, same series.
Dynamic Viscosity at 20 °C: 86 mPa·s, same series.
Dynamic Viscosity at 40 °C: 29.5 mPa·s, same series.
Dynamic Viscosity at 60 °C: 13.2 mPa·s, same series.
Dynamic Viscosity at 80 °C: 7.3 mPa·s, same series.
Dynamic Viscosity at 25 °C: 65.8 mPa·s in a separate published commercial SDS; test method OECD 114.
Boiling Temperature: Approximately 375 °C at normal atmospheric pressure in a published product SDS.
Melting Point: Reported reference value approximately -48 °C, not a batch-certified specification.
Pour Point: Below -45 °C in one representative commercial data sheet; pour point and melting point are not interchangeable.
Freezing Point: Below -67.2 °C in a separate commercial grade SDS; reported values should not be forced into agreement because materials, measurements and definitions may differ.
Flash Point: Representative 232 °C using the Cleveland open cup method; another SDS reports 212 °C using ASTM D3278, so test method is essential.
Vapor Pressure: Below 0.01 mbar at 20 °C in one technical data sheet; an SDS for another grade reports a lower value below 0.00001 hPa at 25 °C.
Water Solubility at 25 °C: Below 0.01 mg/L reported in one product technical data sheet; other scientific and compilation values differ, so selection of the method and temperature matters.
Solubility Behavior: Practically insoluble in water and soluble in suitable organic solvents, subject to solvent choice.
Refractive Index at 25 °C: Representative value 1.488 in a commercial product data sheet.
Surface Tension: 32.3 mN/m in one published technical data sheet; method and temperature should be checked when specified.
Ester Content: At least 99.6% by mass as a published specification for one high-purity commercial grade, not a universal DOTP minimum.
Acid Number: Maximum 0.1 mg KOH/g in that published commercial specification.
Water Content: Maximum 0.1% by mass in that published commercial specification.
Color: Maximum 25 Pt-Co/APHA units in that published commercial specification.
Suspended Matter: Clear oily liquid substantially free of foreign material in that published commercial specification.
Solution Temperature: Representative 146 °C in a published PVC-testing context; not a universal processing instruction.
Plastisol Gelation Temperature: Representative 136 °C in the same testing context; actual gelation behavior depends on resin, formulation and assessment method.
pH: Not applicable to neat DOTP because it is not an aqueous solution.
Shelf Life: Grade, packaging, exposure to moisture and storage temperature dependent; one published grade has a one-year storage recommendation below 40 °C when moisture is excluded.

A substantial decrease in liquid viscosity with increasing temperature is evident in the quoted temperature series. Pump selection, metering accuracy, line pressure and mixing behavior therefore depend strongly on actual product temperature, especially in cooler warehouses. The presence of separate results for different grades is not an error to be removed by averaging; every property should be associated with its measurement conditions and the appropriate product documentation.

Water-solubility values are especially sensitive to the test procedure for very hydrophobic organics. A poorly specified value may reflect detection limits or the behavior of a formulation instead of an intrinsic equilibrated solubility. For engineering and environmental work requiring an exact value, a validated substance-specific test is preferable to a number taken from a broad reseller summary.

Similarly, a flash point is a method-dependent property and not an autoignition temperature. A high flash point does not mean that DOTP is incapable of burning when heated sufficiently. Any hot processing operation must be designed around the current SDS, potential mists, nearby combustibles and equipment operating temperatures.

HOW DOES PLASTICIZER DOTP WORK AT THE MOLECULAR LEVEL?

Plasticization involves changing how neighboring polymer chains interact and move. PVC has a comparatively rigid glassy character at room temperature in the absence of substantial plasticizer, whereas the introduction of a compatible external plasticizer can lower the formulation's effective glass-transition temperature. A greater proportion of chain segments can then move and accommodate deformation under ordinary service loads.

DOTP molecules occupy space within the polymer phase and participate in favorable noncovalent interactions with PVC. The net effect is to reduce constraints on relative chain movement, decrease stiffness and improve elongation or flexibility over suitable composition ranges. This does not mean all mechanical properties improve simultaneously. Tensile strength, modulus, creep resistance, tear performance, compression behavior and temperature stability can change in different directions as plasticizer loading increases.

The effect depends on molecular compatibility and physical distribution. During dry blending, the liquid must be taken up adequately by PVC particles and the rest of the formulation. During plastisol processing, the resin particles must undergo the necessary swelling, gelation and fusion. Insufficient fusion can result in unacceptable strength or surface properties even when the plasticizer is chemically appropriate.

In a finished article, DOTP is normally physically retained rather than covalently attached. Migration can occur by diffusion through the PVC matrix and subsequent transfer to adjacent materials, contacting liquids or air; the observed rate depends on temperature, plasticizer loading, the receiving medium, article thickness and polymer structure. Describing a grade as having good migration resistance is a performance comparison, not a guarantee of zero migration or zero emissions.

Long-term service introduces further considerations. Repeated temperature cycling, extraction by particular oils or detergents, contact with other polymers and sustained loading can affect plasticizer retention and the final mechanical properties. Testing under conditions representative of the intended life of the article is therefore needed, especially where embrittlement, surface tack or staining would be unacceptable.

DOTP's low volatility and useful cold flexibility support its use in some demanding flexible-vinyl systems. However, volatility at one temperature, diffusion in PVC and extraction by a particular liquid are distinct measurements. A product might perform well in one test yet perform less favorably in another, so application selection should rely on multiple relevant metrics.

WHICH INDUSTRIES USE PLASTICIZER DOTP?

Flexible PVC Compounding: DOTP is used as a primary plasticizer in selected resin compounds intended for extrusion, calendaring, coating or other conversion operations. The precise resin choice and required stiffness determine how its contribution is evaluated.

Film and Sheet Manufacturing: Plasticized vinyl film and sheet need balanced flexibility, tear behavior, appearance and process stability. DOTP can be considered where the non-ortho-phthalate identity and mechanical results support the project requirements.

Wire and Cable: DOTP may be included in electrical insulation or sheathing formulations, with decisions based on aging performance, electrical properties, compatibility, flame-retardant packages and applicable cable standards.

Flooring and Wall Coverings: The liquid can plasticize PVC layers that must combine bendability, processability and resistance to changes during service. Formulation testing is needed for contact staining, adhesive compatibility, wear behavior and emissions.

Coated Textiles and Artificial Leather: DOTP can contribute to flexible PVC coatings that are applied to textile substrates. Fabric type, adhesion, surface finish, coating thickness and low-temperature performance influence the result.

Vinyl Plastisols: Paste systems can use DOTP in formulations that are subsequently gelled and fused by heat. Initial paste viscosity and its stability during storage are especially relevant.

Gaskets and Flexible Seals: Certain flexible PVC gaskets and sealing products may employ DOTP where compression behavior, material compatibility and endurance can be demonstrated in the proposed service environment.

Automotive and Consumer Articles: Selected flexible polymer components may contain this class of plasticizer, but suitability is controlled by the exact formulation, product specifications, customer policies and regulatory obligations.

Hoses and Flexible Extrusions: DOTP may assist production of appropriately plasticized PVC extrusions. Resistance to contact fluids, environmental exposure, mechanical fatigue and temperature range requires direct product testing.

PLASTICIZER DOTP IN FLEXIBLE PVC COMPOUNDING

PVC compounding is the principal technical use of DOTP. The material is combined with a PVC resin and an application-dependent set of stabilizers, lubricants, fillers, pigments, processing aids and other additives. A plasticizer should improve the required flexibility while allowing the resin to be processed uniformly and without objectionable phase separation.

The resin's molecular weight and morphology affect plasticizer uptake and fusion. Two resins with the same broad category of “PVC” may require different formulation choices because their K-values, porosity or particle characteristics differ. The usable plasticizer loading therefore cannot be inferred from the product name alone. It is normally expressed relative to the PVC resin using parts per hundred resin (phr), but a universal DOTP phr recommendation would be misleading.

During manufacturing, the plasticizer may be distributed by intensive mixing, dry blending or liquid dispersion techniques. Good distribution supports consistent extrusion or calendaring and reduces the risk of local differences in hardness and appearance. The process must be validated to avoid incomplete incorporation, contamination or instability in the thermal stabilizer system.

Finished flexibility is often assessed with Shore hardness and mechanical properties, but no single Shore number uniquely determines DOTP content. Resin selection, mineral fillers, processing severity, co-plasticizers and other additives can all affect the result. Measurements should be made on conditioned samples prepared according to the intended standard.

A substitution project should compare tensile strength, elongation at break, modulus, tear resistance, low-temperature bendability, volatile loss, extraction and aging behavior. The balance can vary between a soft flexible sheet and a wire insulation compound. A formulation that matches initial hardness may not match fusion, migration or thermal aging, so replacement requires testing beyond a simple one-for-one mass change.

Batch traceability is important where the mechanical properties of a flexible PVC product must remain constant over multiple production campaigns. A batch-specific COA demonstrating key quality parameters provides a stronger purchasing control than a generic catalog description. It should be paired with incoming inspection and verification against the approved formulation.

PLASTICIZER DOTP IN PVC PLASTISOLS AND ORGANOSOLS

Plastisols are dispersions of fine PVC resin particles in a liquid plasticizer-rich medium. They behave differently from a PVC melt because the liquid mixture is stored and handled before thermal fusion. The apparent viscosity is influenced by resin particle size, particle shape, paste-resin chemistry, plasticizer identity, additives, temperature and elapsed storage time.

Published technical descriptions of DOTP-containing pastes report favorable initial viscosity and viscosity stability under the relevant tests. These observations are useful for screening formulations where a paste must be pumped, coated, printed, dipped or cast before curing or gelling. Nevertheless, results from one commercial grade cannot be generalized to every paste resin or assumed to persist unchanged after filler, pigment or stabilizer additions.

The terms gelation and fusion describe related but distinct stages of thermal development. Initially, plasticizer penetrates and swells PVC particles; subsequent thermal energy promotes merging of the polymer-rich domains into a more uniform structure. The time-temperature profile and the degree of fusion influence tensile behavior, porosity, surface appearance and retained mechanical integrity.

A published representative DOTP grade lists solution and gelation temperatures under its own evaluation procedures. Those numbers are useful as comparative test results, not as a universally safe oven set point or dwell time. Production parameters must be established around the specific PVC resin, substrate, article thickness, equipment and thermal stability package.

An organosol contains volatile solvent in addition to the PVC/plasticizer phase. Its solvent evaporation behavior is not the same as that of a solvent-free plastisol, and solvent exposure controls may govern safety decisions. DOTP cannot be treated as the only contributor to emissions or flammability where other organic ingredients are present.

Useful validation parameters include viscosity at controlled shear and temperature, viscosity after storage, wetting of the intended substrate, gelation behavior, film thickness, fusion quality, adhesion and visual finish. Keeping a process record supports comparison of alternatives and helps distinguish raw-material variation from equipment or environmental changes.

PLASTICIZER DOTP IN WIRE AND CABLE APPLICATIONS

Flexible PVC is used in numerous cable jackets and insulation systems where the compound must survive bending, installation stresses and service temperatures. DOTP may serve as a principal or supporting plasticizer in suitable systems because low-temperature flexibility and relatively low volatility are relevant screening properties.

Electrical performance cannot be inferred from plasticizer identity alone. Dielectric behavior, volume resistivity, moisture behavior and potential ionic impurities depend on the complete compound. Moreover, the thermal stabilizer, flame-retardant package and mineral filler system can change the electrical and mechanical balance substantially.

A cable formulation can be subjected to long periods at elevated temperature. As the compound ages, plasticizer loss, PVC degradation and changes in additive interactions can all contribute to embrittlement or dimensional change. DOTP's low volatility can be useful, but its retention must still be demonstrated by the relevant aging and mass-loss tests.

Insulation and sheathing often have different mechanical and regulatory requirements. Materials must be screened against the applicable cable standard, relevant flame behavior and customer specifications; no statement about DOTP alone proves compliance. Resistance to oils, fuels, lubricants, moisture or other contact liquids is especially important for industrial cables.

When replacing another plasticizer, formulators should check electrical properties alongside processing characteristics, hardness, tensile retention and cold-bend results. A material that runs well on an extruder but fails a required aging test is not a successful substitution. The final acceptance basis is the qualified cable compound, not a standalone supplier description.

PLASTICIZER DOTP IN FILMS, SHEETS, FLOORING AND WALL COVERINGS

Plasticized vinyl films and sheets may be calendared, extruded or cast, and each method places different demands on viscosity, thermal response and surface finish. DOTP provides a potential route to flexible, non-ortho-phthalate PVC products, with grades selected according to the intended manufacturing process and article properties.

Thin film performance can be sensitive to small changes in formulation because the high surface-area-to-volume ratio affects transfer to adjacent surfaces and environmental exposure. Migration, blocking, tack, print compatibility, heat-seal behavior and adhesive interaction may therefore require more attention than in a thick molded article.

In flexible flooring, the formulation must be considered as part of an assembly that can include wear layers, printed films, foam layers, reinforcement and adhesives. Plasticizer movement between layers or into an adhesive can cause problems even if the exposed surface initially appears satisfactory. Tests should assess adhesive bonding, indentation, dimensional stability, stain behavior and emissions under relevant conditions.

Vinyl wall coverings and decorative sheets must maintain appearance as well as mechanical function. Potential failure modes include color changes, bleeding into adjacent materials, surface tack and changes in flexibility. A low-color plasticizer is helpful for some decorative formulations, but it does not replace light-stability or compatibility testing with pigments and stabilizers.

Applications marketed for interiors may be subject to voluntary or mandatory emissions testing. DOTP's relatively low vapor pressure is one favorable factor, not proof that the entire finished material meets a particular indoor-air standard. The PVC resin and other additives can contribute independent emissions that have to be measured in the finished product.

PLASTICIZER DOTP IN COATED FABRICS AND ARTIFICIAL LEATHER

PVC-coated textiles can benefit from a plasticizer that provides a flexible surface and appropriate cold performance without unmanageable paste viscosity. DOTP may be used for coated fabrics, artificial leather and related flexible composite materials, depending on substrate treatment, coating equipment and product-performance objectives.

A coated textile is more complex than an isolated PVC film. It includes a fibrous substrate, possible primers or adhesives, a PVC coating and sometimes topcoats or embossed layers. Plasticizer selection can influence bonding, mechanical drape, crack resistance, softness and transfer between layers.

Certain artificial-leather studies compare DOTP with other plasticizers using tensile properties, tear strength, cold flexibility and migration methods. Such research supports selecting a comparative test plan; it should not be used to promise identical outcomes in every polymer or coating recipe.

Critical observations include surface oiliness, staining of fabrics in contact with the coating, resistance to cleaning media, heat-aging appearance and adhesion following repeated flexing. A material that is comfortable and flexible immediately after manufacturing can behave differently after long storage or weathering.

Exposure to skin, sunlight and repeated wet cleaning can introduce regulatory and durability considerations that are distinct from DOTP's basic chemical identity. Final article specifications should include the conditions under which flexibility and appearance must be retained.

PLASTICIZER DOTP IN HOSES, GASKETS AND SELECTED CONSUMER PRODUCTS

Many PVC hoses and flexible extrusions require adequate flexibility while resisting physical damage during repeated bending. DOTP can be evaluated in such compounds when the desired service conditions are compatible with PVC and the chosen additive package. Low-temperature bending and resistance to ordinary environmental exposure may be useful reasons to investigate this plasticizer.

Chemical contact is a separate qualification matter. A compound used in contact with oils, fuels, surfactants or aggressive solvents may lose plasticizer or suffer swelling and changes in physical properties. Tests must employ representative liquids and actual exposure durations rather than relying only on generic statements of extraction resistance.

Flexible gaskets have to meet sealing force, compression set and dimensional requirements. Adding a plasticizer can make the compound softer, but greater softness may not translate to better sealing performance at all temperatures or after long compression. Article design, polymer grade, stabilizer chemistry and filler content can control the result.

Selected toy, childcare and consumer applications have motivated demand for non-ortho-phthalate plasticizers. However, the absence of conventional ortho-phthalates in an ingredient does not itself establish compliance with applicable child-safety, migration or restricted-substance rules. Raw-material impurity limits and the complete finished article need to be checked.

Automotive uses can likewise have demanding odor, fogging, volatile-emissions, cold-flex and aging requirements. Any claim of fitness for a particular vehicle specification should be based on the compound's actual test results and a qualified material approval.

REGULATED AND SENSITIVE APPLICATIONS OF PLASTICIZER DOTP

Regulatory evaluation begins by establishing the exact identity: DOTP is bis(2-ethylhexyl) terephthalate, CAS 6422-86-2, not DEHP. Treating the two as equivalent merely because of their elemental formula can lead to incorrect declarations of regulated substances. Regulatory obligations should be reviewed in the jurisdiction of sale, processing and final article use.

Under the European Union's plastic food-contact framework, the terephthalate substance appears on the Union list as FCM substance 798, reference 92200. A specific migration limit of 60 mg/kg is associated with the entry, and group restriction 32 may also be relevant to the combined contribution of listed plasticizers; current consolidated law and the applicable conditions must be checked before relying on any single numerical limit. Inclusion on a permitted-substance list does not authorize every commercial DOTP grade or every finished article without migration testing, traceability and supporting documentation.

Food contact concerns the migration behavior and lawful composition of the finished plastic article. A substance used to manufacture a food-contact material is not thereby a direct food ingredient or a food additive. Direct addition to foods is not established by the FCM listing, and an E number or INS number should not be invented for DOTP.

Specialized medical or childcare uses require grade-specific quality management and additional evidence, which may include extractables and leachables studies, biocompatibility considerations, documentary traceability and application-specific regulations. Ordinary industrial DOTP should never be described as “medical grade” or “FDA approved” merely because another supplier markets a distinct high-purity product for sensitive applications.

Material declarations can also involve recycled content, impurities, non-intentionally added substances, and the restrictions of a customer's own material specification. A nominally non-ortho-phthalate plasticizer can contain trace contaminants requiring a separate analytical limit. The formal definition of “phthalate-free” must be agreed between supplier and buyer, because a marketing expression alone does not describe the scope or detection limit of the testing performed.

For current regulatory decisions, obtain the latest supplier SDS, current regional regulatory statement, composition disclosure to the permitted extent, and appropriate certificates or migration data. A database listing is useful evidence of identity or a legal entry, but not a substitute for finished-article compliance assessment.

INDUSTRIAL PERFORMANCE AND TESTING CONSIDERATIONS

DOTP performance is best evaluated using properties of the finished polymer as well as the incoming liquid. Representative technical literature reports favorable low-temperature flexibility and low volatility, but those descriptive features have to be connected to an actual test method and a meaningful comparison formulation.

Shore hardness can serve as an initial indicator of softness, particularly in PVC compounds with broadly similar filler systems. It is not, however, a direct measure of plasticizer purity or long-term stability. Two plasticizers adjusted to deliver the same hardness may still produce different tensile strength, elongation, processing torque, low-temperature behavior or extraction resistance.

Plasticizer efficiency is sometimes discussed in terms of how much liquid is needed to reach a specified hardness or modulus. This is a comparative formulation characteristic rather than an immutable property of the plasticizer molecule. Resin grade, stabilization package, filling level and test conditioning must remain consistent during comparisons.

Low-temperature flexibility is relevant where articles can be bent or handled in cold service. Standardized cold-bend, brittleness-temperature and dynamic-mechanical measurements each characterize a different aspect of behavior. Results from a single test should not be generalized to every type of failure or article geometry.

Volatility may be evaluated by mass loss during controlled heat exposure or by analytical measurements of emissions. Extraction resistance is assessed with selected contact liquids under defined times and temperatures. Migration to another polymeric material is yet another property and should be checked where PVC will touch adhesive, rubber, paint, paper or other finished surfaces.

For plastisols, tracking viscosity immediately after preparation and after standardized storage offers a clearer performance picture than one initial reading. Appropriate comparisons also record spindle or shear conditions, temperature, resin type and additive content. Process engineers should use this information to anticipate pumping, spreading and coating performance while avoiding the assumption that a measured liquid viscosity equals the viscosity of a compounded paste.

The optimal DOTP grade will therefore vary with the application. Good analytical purity is generally desirable, but unnecessary purchase of a specialized low-impurity grade may not improve a conventional industrial formulation. Conversely, applications with strict impurity or migration limits cannot be qualified solely on the basis of a standard technical data sheet.

WHAT PROBLEMS CAN PLASTICIZER DOTP HELP ADDRESS?

Rigid PVC lacks the flexibility required for many films, cables, seals and coated articles. DOTP can reduce compound hardness and improve elongation and deformation behavior when added in suitable amounts and properly processed. It allows engineers to work toward a flexible PVC target without switching to a completely different polymer family.

Some manufacturers must replace specific ortho-phthalate plasticizers in order to meet customer or regulatory requirements. DOTP offers an alternative with a distinct chemical identity and a well-established history in flexible PVC. A successful substitution still requires composition verification, process qualification and application testing; the material cannot automatically inherit certificates issued to another formulation.

Cold-temperature embrittlement is a relevant performance concern for cables, sheets and outdoor flexible goods. Properly formulated DOTP-containing PVC may help address this problem, but the actual flexibility limit depends on the formulation, the testing method and the article's exposure history.

High paste viscosity or unstable storage viscosity can interfere with coating consistency in some plastisol operations. Technical data for representative DOTP materials indicate that favorable paste handling is possible. This should be considered a screening reason rather than a universally assured viscosity reduction in every PVC paste.

Loss of flexibility caused by volatility, extraction or transfer is another concern for flexible polymers. DOTP's physical properties may be advantageous in certain comparisons, but tests must reflect actual receiving media, environmental temperatures and contact durations. No external plasticizer is guaranteed to remain immobile forever.

Finally, consistent low-color raw material can make it easier to control the appearance of light-colored or transparent products. A low-color plasticizer cannot correct defects caused by inadequate thermal stabilization, contamination or unsuitable pigments, so it is one part of a larger quality system.

IMPORTANT CONSIDERATIONS WHEN USING PLASTICIZER DOTP

Compatibility: Evaluate the selected PVC resin and all other formulation ingredients together. Commercial claims of general compatibility with vinyl resin are useful starting points but do not define the behavior of every copolymer or filled mixture.

Plasticizer Loading: Define the dosage against a measurable formulation target such as hardness, cold flexibility or paste viscosity. Avoid copying a percentage from an unrelated recipe because the needed amount depends on the rest of the compound.

Gelation and Fusion: Confirm sufficient PVC fusion while keeping temperatures and dwell periods compatible with the stabilizer system and the conversion equipment. A published solution-temperature value is not a recommended oven schedule for all products.

Thermal Stability: Consider the PVC stabilization package and residence time at processing temperature. DOTP's high boiling point does not make the PVC formulation immune to heat damage or discoloration.

Migration and Contact Staining: Test the final compound against contact materials such as adhesives, coatings, packaging layers or adjacent plastics. Low vapor pressure alone does not prove low migration in these contact situations.

Impurities and Acidity: Water and acidic contaminants may affect formulation quality, appearance or interactions with stabilizers. Review the approved technical specification and batch COA rather than assuming all DOTP grades have the same minimum ester content.

Storage Temperature: Low temperature raises liquid viscosity markedly. Delivery, pumping and metering systems may need appropriate design and temperature controls without exceeding the validated storage conditions.

Environmental Release: Avoid discharge of DOTP into drains and control spills. Limited water solubility does not make uncontrolled environmental release acceptable.

Regulatory Declarations: Establish whether the requirement concerns the absence of particular ortho-phthalates, a defined analytical limit, food-contact eligibility or another specific restricted-substance framework. A single “non-phthalate” phrase cannot replace those checks.

Product Identity: Insist on CAS-specific documentation and do not substitute DEHP or mixed plasticizer blends when the approved bill of materials calls for DOTP.

STARTING FORMULATION AND EVALUATION APPROACHES

A practical development program starts with the finished article requirements. Specify the PVC resin, product geometry, operating temperatures, target flexibility, relevant fluids, electrical or mechanical standards and any regulatory constraints. The proposed plasticizer should then be evaluated within a controlled formulation rather than in isolation.

For flexible PVC compounding, maintain a consistent resin and additive package while comparing DOTP against the current approved plasticizer. Establish an initial comparison at a documented plasticizer content and then adjust toward defined hardness or flexibility targets, recording every change. There is no universally validated DOTP concentration that can be given for all PVC resins and end uses.

Measure processing indicators appropriate to the operation: dry-blend uptake, mixing torque, extrusion quality, sheet appearance, or plastisol viscosity. Where thermal gelation or fusion is involved, verify it using the actual process equipment or validated laboratory tests. Processing temperatures and times should follow the complete resin-and-additive system's qualification, not a stand-alone generic recommendation.

Evaluate mechanical performance using standardized procedures for hardness, tensile strength, elongation, flexibility and tear resistance. For cold-service applications, include an appropriately selected low-temperature test. For high-temperature or long-life articles, compare properties before and after accelerated aging; accelerated results still require careful interpretation against expected real service.

If the finished PVC contacts other materials, examine extraction, staining, migration and adhesive compatibility. For consumer or indoor uses, emission and odor testing may be needed. For food-contact applications, the correct simulated-use migration studies and documentation are essential.

The outcome should be a written acceptance decision supported by measurable data. Without a supplied formulation and validated reference conditions, offering a precise recipe, guaranteed loading, processing set point or service-life estimate would create an unwarranted impression of certainty.

SIMILAR PRODUCTS AND ALTERNATIVES

DEHP / DOP: A conventional ortho-phthalate plasticizer that shares DOTP's molecular formula but differs in the position of its ester groups and its regulatory profile. It should never be treated as an exact synonym or automatically acceptable substitute where the specification explicitly requires DOTP.

DINP and DIDP: Commercial ortho-phthalate plasticizer families employed in suitable PVC systems. They can provide useful flexibility and processing characteristics, but are chemically different from DOTP and may face distinct application-specific restrictions.

DINCH: A cyclohexanedicarboxylate-based alternative used in selected flexible applications, including some sensitive markets. Its compatibility, performance, procurement requirements and application-specific authorizations need their own evaluation.

TOTM: A trimellitate plasticizer often considered for low-volatility and higher-temperature service targets. Its viscosity, processing response, efficiency and low-temperature flexibility may differ from DOTP, so a substitution requires comprehensive testing.

Adipate Plasticizers: Di(2-ethylhexyl) adipate and related materials may offer excellent low-temperature properties in certain formulations. Extraction or volatility behavior can be different from that of DOTP, and any benefit must be balanced against the application's requirements.

Citrate Plasticizers: Some citrate esters are used when particular formulation or regulatory criteria matter. They do not necessarily match DOTP's plasticization efficiency, processing behavior, water resistance or service temperature range.

Polymeric Plasticizers: Higher-molecular-weight materials may be chosen where migration or extraction resistance is especially important. They can differ in viscosity, compatibility, processing and low-temperature properties; a polymeric plasticizer is not a direct molecular replacement for DOTP.

Epoxidized Oils: Certain epoxidized plant-derived oils can perform complementary plasticizing or stabilizing functions. They should not be assumed to reproduce all properties of DOTP at a one-to-one dosage because composition, functionality and heat-stabilization behavior differ.

Selecting an alternative requires matching the correct performance profile, not merely an overlapping advertised use. Technical evaluation should prioritize the identified failure mode: paste viscosity, temperature flexibility, extractability, emissions, regulatory qualification or long-term durability.

INITIAL FORMULATION APPROACHES FOR PLASTICIZER DOTP

The following examples illustrate how PLASTICIZER DOTP can be evaluated in flexible polyvinyl chloride (PVC) formulation research and process development. PLASTICIZER DOTP, also known as dioctyl terephthalate, di(2-ethylhexyl) terephthalate, or DEHT, is a terephthalate ester plasticizer identified by CAS number 6422-86-2. PLASTICIZER DOTP is used to modify PVC flexibility and processing behavior in applications such as wire and cable compounds, coated fabrics, and flexible vinyl flooring. DOTP is a terephthalate plasticizer and should not be confused with dioctyl phthalate (DOP/DEHP), an ortho-phthalate with a different chemical structure.

The examples below are illustrative laboratory development approaches, not validated commercial recipes, manufacturing instructions, or finished products certified to any standard. PLASTICIZER DOTP concentration, PVC resin grade, thermal stabilizer, filler, processing conditions, and end-use requirements can materially change the results. The proposed quantities are preliminary screening levels and must be verified by controlled laboratory trials, product-performance testing, material compatibility studies, occupational-safety review, and applicable regulatory checks. Concentrations are expressed in phr (parts per hundred parts of PVC resin by weight), not as percentages of the finished formulation. The total phr value is therefore not expected to equal 100.

EXAMPLE 1: PLASTICIZER DOTP DOSAGE SCREENING IN FLEXIBLE PVC WIRE AND CABLE COMPOUNDS

Objective: To evaluate how PLASTICIZER DOTP loading influences flexibility, Shore hardness, tensile properties, low-temperature behavior, thermal aging, and processing characteristics in a laboratory PVC cable-jacketing compound.

Starting components:

Suspension-grade PVC resin: 100 phr, held constant.

PLASTICIZER DOTP: approximately 35, 45, and 55 phr, tested as separate screening levels.

Calcium-zinc (Ca/Zn) heat-stabilizer system: approximately 2–3 phr, held constant at a supplier-appropriate level.

Calcium carbonate filler: approximately 10–25 phr, held constant during the initial PLASTICIZER DOTP comparison.

Epoxidized soybean oil or another compatible secondary stabilizing aid, if required: approximately 2–4 phr, held constant.

Lubricant or processing aid (for example, a compatible polyethylene-wax grade): approximately 0.2–0.5 phr, held constant.

Processing temperature, residence time, and mixing intensity: selected for the specific PVC grade and stabilizer package, then held constant across comparative trials.

Increasing PLASTICIZER DOTP content may reduce compound hardness while affecting tensile strength, elongation, and dimensional behavior. The actual balance depends on the complete formulation and cannot be predicted reliably from PLASTICIZER DOTP dosage alone.

Application approach:

1. Weigh the PVC resin, PLASTICIZER DOTP, heat stabilizer, filler, and other selected ingredients according to the phr-based laboratory recipe.

2. Premix the PVC resin and solid ingredients in a suitable laboratory mixer, following the approved compounding procedure.

3. Introduce PLASTICIZER DOTP gradually to promote uniform absorption and distribution in the PVC blend. Add other liquid auxiliaries under controlled mixing as appropriate.

4. Compound each formulation in suitable laboratory PVC processing equipment using a previously assessed thermal-processing window and comparable residence times.

5. Prepare standardized test plaques or extruded specimens at a consistent thickness and condition them before testing.

6. Measure Shore hardness, tensile strength, elongation at break, density, low-temperature flexibility, and appearance. Record processing torque, melt behavior, and any signs of surface exudation.

7. Conduct appropriate heat-aging, electrical, and mechanical evaluations for the intended cable application, including volume resistivity and applicable insulation or jacketing tests where relevant.

8. Compare the PLASTICIZER DOTP loading levels and select a preliminary candidate based on the target balance of flexibility, strength, processability, and long-term performance.

Safety consideration: PVC compounding involves heated equipment and may generate hazardous decomposition products if the PVC formulation overheats. Use ventilation, temperature controls, suitable protective equipment, and the current safety data sheets for PLASTICIZER DOTP and all other ingredients. A laboratory cable formulation does not establish compliance with electrical, fire-performance, or cable-product standards; these require dedicated qualification testing.

EXAMPLE 2: PLASTICIZER DOTP LEVEL EVALUATION IN PVC PLASTISOL COATED-FABRIC FORMULATIONS

Objective: To study how PLASTICIZER DOTP concentration affects plastisol viscosity, viscosity development during storage, coating uniformity, fusion behavior, flexibility, and plasticizer migration in a PVC-coated fabric system.

Starting components:

PVC paste resin suitable for plastisol processing: 100 phr, held constant.

PLASTICIZER DOTP: approximately 50, 65, and 80 phr, evaluated as separate screening levels.

Compatible Ca/Zn or other supplier-approved plastisol heat stabilizer: approximately 2–3 phr, held constant.

Calcium carbonate filler: approximately 10–20 phr, held constant.

Wetting or air-release additive compatible with the selected plastisol: approximately 0.3–0.7 phr, held constant.

Pigment dispersion, if required: approximately 1–3 phr, held constant in a defined pigment grade.

Coating thickness, mixing method, deaeration procedure, and fusion profile: held constant for comparative testing after preliminary process validation.

PLASTICIZER DOTP can influence the initial and aged viscosity of PVC plastisols as well as their fusion and final film properties. The stated loadings are laboratory starting points; the optimal PLASTICIZER DOTP amount depends on resin particle characteristics, substrate requirements, coating equipment, and desired flexibility.

Application approach:

1. Select a PVC paste resin and textile substrate appropriate for the intended laboratory coating evaluation.

2. Premix PLASTICIZER DOTP with the chosen heat stabilizer, wetting aid, and pigment dispersion, if used, according to the compatibility of the ingredients.

3. Introduce the PVC paste resin gradually into the liquid phase under controlled, preferably low-shear mixing to limit air entrapment and uncontrolled viscosity changes.

4. Add the fixed filler quantity and mix until the PLASTICIZER DOTP plastisol appears homogeneous. Remove entrained air using the established laboratory procedure.

5. Record initial plastisol appearance and viscosity, and repeat viscosity measurements after defined storage intervals under standardized conditions.

6. Apply each PLASTICIZER DOTP plastisol to the same textile substrate at a controlled wet-film thickness.

7. Gel and fuse the coating with an approved equipment-specific temperature and residence-time profile. Assess coating continuity, adhesion, flexibility, surface appearance, and evidence of incomplete fusion or thermal damage.

8. Compare the different PLASTICIZER DOTP levels using bending, adhesion, tensile, and migration or exudation tests. Select a candidate for extended storage and end-use qualification studies.

Safety consideration: Plastisol processing requires assessment of heated PVC stability, exhaust ventilation, and prevention of contact with hot surfaces. Avoid prolonged skin and eye contact with PLASTICIZER DOTP and review the safety documentation for all additives. Confirm the suitability of the selected fabric and coating for the intended use. Product-specific limits on substances, emissions, flammability, and migration must be checked before commercial production.

EXAMPLE 3: PLASTICIZER DOTP FLEXIBILITY SCREENING IN FILLED PVC FLOORING OR FLEXIBLE SHEET COMPOUNDS

Objective: To determine the influence of PLASTICIZER DOTP dosage on sheet flexibility, indentation response, tensile performance, dimensional stability, and aging behavior in a filled flexible PVC sheet formulation intended for flooring development.

Starting components:

Suspension-grade PVC resin suitable for sheet production: 100 phr, held constant.

PLASTICIZER DOTP: approximately 25, 35, and 45 phr, evaluated as separate screening levels.

Compatible Ca/Zn heat stabilizer: approximately 2–3 phr, held constant.

Calcium carbonate filler: approximately 50–80 phr, held constant within the screening series.

Processing aid suitable for the selected PVC system: approximately 0.5–1.5 phr, held constant.

External or internal lubricant: approximately 0.2–0.5 phr, held constant.

Colorant or pigment concentrate, if required: approximately 0.5–2 phr, held constant.

Sheet thickness, mixing conditions, thermal-processing profile, and conditioning period: held constant.

The PLASTICIZER DOTP loading in this example is intended to reveal formulation trends rather than define a universal flooring specification. Higher filler content can significantly alter apparent flexibility, tensile behavior, wear resistance, and PLASTICIZER DOTP compatibility; the chosen filler grade and particle size must remain consistent during the comparison.

Application approach:

1. Weigh the PVC resin, PLASTICIZER DOTP, stabilizer, filler, processing aid, and lubricant on the basis of the selected phr trial formulation.

2. Prepare a uniform dry blend using a suitable mixing procedure, incorporating PLASTICIZER DOTP in a manner that supports even distribution without excessive local wetting.

3. Process the blends into laboratory sheets using equipment and temperatures established as suitable for the PVC/stabilizer system.

4. Keep sheet thickness and cooling conditions comparable for all PLASTICIZER DOTP concentrations, then condition samples before analysis.

5. Measure Shore hardness, tensile strength, elongation, dimensional change, and controlled indentation or compression behavior.

6. Examine surface appearance, color uniformity, potential PLASTICIZER DOTP exudation, and signs of filler-related defects.

7. Conduct appropriate thermal-aging, wear, cleaning-chemical resistance, and migration studies aligned with the intended flooring or sheet application.

8. Compare the PLASTICIZER DOTP levels and identify a formulation candidate that balances flexibility, dimensional stability, durability, and process performance.

Safety consideration: Use guarded processing equipment and effective ventilation to control exposure to hot PVC compounds and any decomposition fumes. Follow the PLASTICIZER DOTP supplier's safety and storage recommendations. A laboratory sheet that passes initial flexibility tests is not automatically qualified for commercial flooring. Fire classification, slip resistance, emissions, wear, and applicable building-product or consumer-product requirements need separate verification.

QUALITY CONTROL AND PURCHASING CRITERIA

A robust purchasing description begins with the name Plasticizer DOTP and CAS 6422-86-2. The approved supplier specification should define measurable quality parameters rather than relying on appearance alone. Appropriate incoming tests often include ester content or assay, color, acid number, moisture, density, and clarity or foreign-matter inspection.

One published high-purity DOTP specification gives minimum ester content of 99.6% by mass, maximum acid number 0.1 mg KOH/g, maximum water 0.1% by mass, and maximum color 25 APHA. These are concrete examples of grade-specific acceptance limits, not universal industry minima or specifications automatically offered by Ataman Kimya. The procurement document must identify the actual material and accepted test methods.

Acid number indicates the amount of acidic constituents measurable under the chosen method. It can be useful as a quality indicator, but does not replace an impurity profile. Water content can be important for process reproducibility and storage quality; methods such as Karl Fischer analysis may be appropriate when specified.

Density measurements are useful for identity screening and volumetric handling, but they are not definitive proof of purity. Refractive index, chromatographic composition, infrared spectral comparison or other analytical methods may be needed for particular supply contracts. Where the absence of restricted orthophthalates is part of the specification, an appropriate targeted analytical test and detection limits are necessary.

Color can be especially important for light or transparent products. A small increase in color may be acceptable in highly pigmented industrial compounds but unsuitable for clear films. Visual clarity and suspended matter should be checked for contamination that could cause defects or plugging in fine processing equipment.

A technical data sheet (TDS) summarizes application information, specifications or typical properties. A safety data sheet (SDS) addresses hazard communication, exposure controls, storage and transport. A certificate of analysis (COA) reports results for a particular batch under the supplier's quality system. These documents serve different purposes and should not be used interchangeably.

Purchasers should specify approved grade, quantity, packing form, preferred test methods, identity documents, traceability requirements and intended-use restrictions. Packaging may involve drums, intermediate bulk containers or bulk transport, depending on supplier offering and customer scale. Available configurations, present stock and delivery terms require current commercial confirmation.

Shelf life and storage suitability should be assessed from the actual supplier documentation. A one-year recommendation below 40 °C under moisture-excluding conditions exists for one published grade, but it must not be automatically assigned to every commercial DOTP product. Quality checks may be needed after unusually long storage, open-container handling or exposure to unsuitable conditions.

FIRST AID

Inhalation
If DOTP vapor, mist or aerosol has been inhaled, move the exposed person to fresh air and keep them at rest. Seek prompt medical assessment if breathing difficulty develops; hot-process mist exposures require particular attention even though the neat liquid has low vapor pressure at room temperature.

Skin Contact
After skin contact with Plasticizer DOTP, remove contaminated clothing and wash the exposed skin thoroughly with soap and water. Obtain medical advice if persistent redness, irritation or other symptoms appear; do not use aggressive solvents to remove the liquid from the skin.

Eye Contact
If dioctyl terephthalate enters the eyes, rinse carefully with running water for at least 15 minutes while holding eyelids open and remove contact lenses if this is easy to do. Seek medical evaluation, particularly when irritation persists or a substantial amount entered the eye.

Ingestion
If DOTP is swallowed, rinse the mouth and obtain medical advice promptly, following the current SDS and poison-center instructions. Do not induce vomiting unless instructed by a medical professional, and never give anything orally to a person who is unconscious or unable to swallow safely.

Note to Physicians
For Plasticizer DOTP exposure, treatment is generally directed toward symptoms and clinical assessment; a published supplier SDS reports no known specific antidote. Provide the current product SDS to medical personnel, particularly if the exposed material is a DOTP-containing blend with other hazardous ingredients.

Hot Liquid Exposure
Where heated DOTP contacts the skin, burns may arise from temperature independently of the liquid's chemical classification. Cool thermal burns with suitable running water and seek medical care according to burn severity; do not peel adhered material from damaged skin without professional guidance.

HANDLING AND STORAGE

Handling
Handle Plasticizer DOTP using good industrial hygiene and a transfer system suited to a moderately viscous organic liquid. Minimize unnecessary skin and eye contact, avoid creating airborne mists and keep food and beverages away from manufacturing areas.

Engineering Controls
Provide adequate ventilation for DOTP handling and local exhaust where heated material, spray, mist or vapor can be generated. Verify transfer temperatures and equipment materials before use; a closed system can reduce spills, contamination and avoidable exposure.

Personal Protection
Wear chemical-resistant gloves and suitable protective clothing when contact with DOTP is possible. Use safety glasses with side shields and a face shield where splashing is foreseeable, selected according to the site risk assessment and the current SDS.

Respiratory Protection
A DOTP respiratory-protection program should follow the current SDS and measured or assessed exposure conditions. Suitable respiratory protection may be required where local exhaust is insufficient and mists or vapors can develop; respirators are not a substitute for adequate engineering controls.

Storage
Keep dioctyl terephthalate in clearly labeled, tightly closed containers protected from moisture, contamination and excessive heat. One published grade describes storage below 40 °C with moisture exclusion, but the specific storage limits and shelf life must come from the purchased grade's documentation.

Material Compatibility
Keep DOTP away from strong oxidizing agents as indicated in a published supplier SDS. Containers, seals, liners, hoses and pumps should be checked for compatibility because DOTP is itself a plasticizer and may interact with certain polymeric materials over extended contact.

Spill Procedures
For a DOTP release, secure the area, prevent slipping and contain the liquid before it reaches drains. Recover large amounts by appropriate pumping where safe and collect remaining material with compatible absorbent for disposal according to local requirements.

Environmental Precautions
Do not discharge Plasticizer DOTP directly into watercourses, soil or sewer systems. Poor water miscibility and a generally favorable hazard profile do not remove the obligation to control releases and manage industrial waste responsibly.

Fire Response
DOTP is combustible when sufficiently heated, even though its representative flash points are comparatively high. Suitable extinguishing media identified in a published supplier SDS include carbon dioxide, dry chemical, foam and water spray; firefighters should use appropriate protective equipment, and direct high-pressure water jets may be unsuitable.

Waste Disposal
Dispose of DOTP waste, contaminated absorbents and packaging in accordance with the applicable waste rules and authorized waste-management procedures. Do not repurpose used containers for food or potable water, and evaluate any blended or contaminated waste according to its complete composition.

SAFETY AND TRANSPORT INFORMATION

DOTP should not be described as harmless merely because many commercial grades are not classified as hazardous under the relevant GHS criteria. A published United States supplier SDS for a representative DOTP product states that no GHS hazard classification or hazard-warning label is required for that product. Classifications must nevertheless be checked for the actual grade, region and current SDS revision.

The liquid has a high reported flash point and low vapor pressure under ambient conditions, but it is combustible. Heated processing, mist formation and proximity to ignition sources call for ordinary combustible-liquid precautions. Bulk storage and transfer systems should address containment, slips, temperature control and fire response in addition to chemical exposure.

Avoid prolonged unnecessary skin contact and direct eye splashes. A published supplier SDS advises thorough flushing after eye contact and notes that slight eye irritation may occur, even though its overall product classification does not require a hazard label. The absence of a formal hazard class is not a reason to omit safety glasses or appropriate protective gloves.

Environmental risk assessments must consider the very low water solubility, process wastewater conditions and local discharge rules. A supplier SDS reports readily biodegradable behavior according to the particular test it cites, but environmental fate is not captured by one biodegradation statement alone. Spills should be prevented, and wastewater treatment suitability should be evaluated for the actual release scenario.

Transport Example for a Representative DOTP Grade:
Land Transport: Not classified as dangerous goods under the cited US DOT transport rules in a published SDS.
Sea Transport: Not classified as dangerous goods under IMDG in the same SDS.
Air Transport: Not classified as dangerous goods under IATA/ICAO in the same SDS.
UN Number: Not assigned as a dangerous-goods entry for that cited product classification.
Transport Hazard Class: Not applicable to that cited non-dangerous-goods classification.
Packing Group: Not applicable to that cited non-dangerous-goods classification.

These examples apply to the referenced neat-DOTP supplier SDS, not necessarily to every mixture or formulation containing DOTP. Transport classification must be checked using the current, regionally appropriate SDS and the actual chemical composition. Packaging and labeling requirements can still apply to material that is not regulated as dangerous goods.

Hazard classifications, environmental restrictions, occupational exposure control and waste management should be treated as distinct questions. A material can be non-classified for one regulatory purpose while still needing responsible industrial handling and a complete end-use risk assessment.

FREQUENTLY ASKED QUESTIONS ABOUT PLASTICIZER DOTP

What is Plasticizer DOTP?
Plasticizer DOTP is bis(2-ethylhexyl) terephthalate, a high-boiling organic diester mainly used to soften and improve the flexibility of suitable PVC formulations.

What does DOTP stand for?
DOTP is the common abbreviation for dioctyl terephthalate, in which the ester chains are typically branched 2-ethylhexyl groups.

What is the CAS number of DOTP?
The CAS number of bis(2-ethylhexyl) terephthalate is 6422-86-2.

What is the EC number of DOTP?
Plasticizer DOTP's EC / EINECS number is 229-176-9.

What is the molecular formula of DOTP?
The molecular formula is C24H38O4.

What is the molecular weight of DOTP?
The molecular mass is approximately 390.56 g/mol.

Is dioctyl terephthalate the same as DEHT?
Yes. DEHT and DOTP commonly refer to bis(2-ethylhexyl) terephthalate, CAS 6422-86-2.

Is DEHTP another abbreviation for DOTP?
DEHTP is encountered as an alternative abbreviation for di(2-ethylhexyl) terephthalate; CAS 6422-86-2 should be used to confirm identity.

Is DOTP the same as DOP or DEHP?
No. DEHP / DOP is an ortho-phthalate isomer, CAS 117-81-7; DOTP is the para-terephthalate isomer, CAS 6422-86-2.

Why do DOTP and DEHP share a molecular formula?
They are positional isomers with the same atoms but different attachment positions of the ester groups on the benzene ring.

Is DOTP a phthalate?
Plasticizer DOTP is a terephthalate diester, commonly marketed as a non-ortho-phthalate plasticizer; this term distinguishes it from conventional ortho-phthalates.

Does DOTP contain 2-ethylhexyl groups?
Yes. Each ester linkage is connected to one branched 2-ethylhexyl chain.

What is the main industrial use of DOTP?
Plasticizer DOTP's principal application is as an external plasticizer for flexible PVC compounds and plastisols.

How does DOTP soften PVC?
Plasticizer DOTP changes noncovalent interactions and segmental mobility in the polymer, enabling greater flexibility and typically lowering the formulation glass-transition temperature.

Does DOTP chemically bond to PVC?
In conventional external plasticization Plasticizer DOTP remains physically incorporated rather than covalently bonded to the polymer chains.

Is DOTP a reactive diluent?
No. In PVC applications DOTP is a nonreactive external plasticizer, not an acrylate reactive diluent or curing agent.

Can Plasticizer DOTP be used in rigid PVC?
DOTP can be introduced where flexibility is desired, but adding significant plasticizer changes the material away from typical rigid-PVC performance.

Is DOTP compatible with PVC homopolymers?
Published product information describes compatibility with vinyl homopolymers, but the specific resin grade and complete formulation still require testing.

Can DOTP be used in PVC copolymers?
Yes, selected vinyl copolymers may be compatible; suitability depends on their composition and the final formulation.

Can Plasticizer DOTP be used in plastisols?
Yes. DOTP is used in certain PVC paste systems in which viscosity, storage stability, gelation and fusion must be evaluated.

Can DOTP improve paste viscosity?
Representative grade documentation reports favorable initial and storage viscosity in suitable plastisols, but a numerical result cannot be guaranteed for an unspecified resin.

Does DOTP have one universal PVC dosage?
No. Loading depends on resin type, filler system, hardness target, processing conditions and required final properties.

What does phr mean in a DOTP formulation?
Phr means parts by weight of ingredient per 100 parts by weight of resin and is commonly used when comparing PVC compound recipes.

Can Plasticizer DOTP be used in wire and cable compounds?
Yes, subject to full tests of aging, cold flexibility, mechanical properties, electrical behavior and the relevant cable standard.

Can Plasticizer DOTP be used in vinyl flooring?
It is used in suitable vinyl flooring formulations, but migration, odor, dimensional stability, emissions and adhesion must be verified in the full article.

Can DOTP be used in artificial leather?
Yes. It can be evaluated in flexible PVC-coated textile systems where coating adhesion, drape, cold flexibility and staining performance matter.

Can DOTP be used in flexible films and sheets?
Yes. Film and sheet are established use categories, with required validation of appearance, migration, mechanics and processing compatibility.

Can Plasticizer DOTP be used in hoses?
It may be used in selected flexible PVC hose compounds, but chemical-contact resistance and service performance must be checked.

Can DOTP be used in gaskets?
Certain flexible vinyl gasket systems may use DOTP; compression set, sealing performance and fluid compatibility need specific qualification.

Can DOTP be used in medical devices?
Some specialized DOTP grades may be assessed for medical applications, but ordinary industrial DOTP has no automatic medical-grade or device approval.

Can DOTP be used in toys?
Selected toy formulations may employ DOTP, provided the complete article and its impurities meet the relevant product-specific requirements.

Is DOTP authorized for plastic food-contact materials in the EU?
Bis(2-ethylhexyl) terephthalate appears as FCM substance 798 in the Union list; lawful use requires compliance with current restrictions, migration limits and finished-article documentation.

What is the EU FCM substance number for DOTP?
The entry is FCM number 798, with reference number 92200.

What migration restriction applies to DOTP in EU food-contact plastics?
The Union-list entry includes an SML of 60 mg/kg and an associated group restriction; current consolidated rules and the entire formulation must be assessed.

Is DOTP a permitted food additive?
No food-additive E/INS designation is established by its food-contact plastics listing, which is a different regulatory category.

Does DOTP have an E number?
No verified E number is used for DOTP as a direct food additive in this industrial product profile.

What does DOTP look like?
Commercial DOTP is normally a clear, colorless to pale, oily liquid with a mild or nearly absent odor.

What is DOTP density at 20 °C?
One published technical sheet reports approximately 0.982 g/cm3 at 20 °C; grade-specific gravity specifications may define a slightly different range.

What is the viscosity of DOTP at 25 °C?
A published product SDS reports dynamic viscosity of 65.8 mPa·s at 25 °C; temperature and grade must accompany any quoted value.

Why does DOTP become more viscous in cold storage?
Molecular mobility decreases as temperature falls, and a published grade shows a steep rise in dynamic viscosity between warm and subzero conditions.

Is DOTP soluble in water?
DOTP is practically insoluble in water; reported numerical solubility values vary with the source and test procedure.

Is DOTP miscible with water?
No. Neat DOTP is essentially immiscible with water under ordinary conditions.

What is the boiling point of DOTP?
A published supplier SDS reports approximately 375 °C at standard atmospheric pressure; other references report somewhat different values.

What is the melting point of DOTP?
A literature reference reports around -48 °C, but commercial pour-point and freezing-point results are different measurements and should not be substituted.

What is a typical DOTP flash point?
Representative published values include 232 °C by Cleveland open cup and 212 °C by another specified flash-point method; the method must always be stated.

Is Plasticizer DOTP flammable?
It has a relatively high flash point but is combustible when sufficiently heated; hot processing and mist generation require precautions.

Does Plasticizer DOTP evaporate readily at room temperature?
It has low reported vapor pressure at room temperature, although the finished compound can still exhibit emissions and other additive losses.

Does low volatility mean DOTP cannot migrate?
No. Migration through PVC into adjacent materials and extraction by contacting liquids are different mechanisms from evaporation.

Does DOTP permanently remain in PVC?
No external plasticizer is automatically permanent; diffusion and loss can occur depending on the formulation and service conditions.

What is the difference between migration and extraction?
Migration refers to movement and transfer into another phase or surface, while extraction specifically concerns removal by a contacting medium such as a solvent.

What tests help assess DOTP migration?
Appropriate tests can involve contact with representative materials, mass change, analytical extraction, accelerated aging and finished-article migration methods.

Can Plasticizer DOTP improve low-temperature flexibility?
Suitable DOTP/PVC combinations can exhibit favorable low-temperature performance, but the benefit must be confirmed in the intended compound.

Is Plasticizer DOTP suitable for high-temperature cable service?
Its low volatility is useful for screening, but compound aging, electrical performance, stabilization and cable-standard requirements control suitability.

How is DOTP different from TOTM?
TOTM is a trimellitate plasticizer with different thermal, viscosity and formulation trade-offs; they are not identical drop-in materials.

How is DOTP different from DINCH?
DINCH is a cyclohexanedicarboxylate plasticizer with a different molecular structure, performance profile and grade-specific regulatory context.

How is DOTP different from adipate plasticizers?
Adipates may be useful for particular cold-flexibility targets but can differ from DOTP in volatility, compatibility or resistance to extraction.

Can epoxidized oils replace DOTP completely?
They can provide complementary or alternative formulation functions in some systems, but replacement requires testing and should not be assumed at equal dosage.

How can DOTP purity be checked?
A suitable method can include ester-content analysis with checks for acidity, water, color, clarity and, where necessary, targeted impurities.

What ester content is available in high-purity DOTP specifications?
One published commercial grade specifies a minimum of 99.6% ester content by mass; this is not guaranteed for every generic DOTP shipment.

What acid value is shown in a published DOTP specification?
One commercial specification gives a maximum acid number of 0.1 mg KOH/g using a stated test method.

What moisture limit is shown in a published DOTP specification?
One commercial specification gives a maximum of 0.1% water by mass; approved grade requirements may differ.

Why does DOTP color matter?
Color may affect the appearance of clear or light-colored vinyl products and can serve as an incoming-quality indicator.

What is the purpose of a DOTP TDS?
The technical data sheet summarizes product identity, representative physical properties, specifications and suggested applications.

What is the purpose of a DOTP SDS?
The safety data sheet provides current hazard communication, first aid, protection, storage, emergency and transport information for the supplied material.

What is a DOTP certificate of analysis?
A COA records batch-specific test results and is used to verify compliance with an agreed purchasing specification.

Is DOTP universally classified as nonhazardous?
A published commercial grade is not classified under the cited GHS rules, but the actual grade, jurisdiction and latest SDS must be checked.

Does DOTP require eye protection?
Safety glasses are appropriate where splashing can occur, even when a grade has no formal GHS hazard classification.

What should be done if DOTP enters the eyes?
Rinse with running water for at least 15 minutes and seek medical evaluation, following the current SDS.

What should be done after skin contact with DOTP?
Wash the area thoroughly with soap and water, remove contaminated clothing and seek medical advice for persistent symptoms.

What should be done if DOTP is swallowed?
Rinse the mouth, seek professional medical guidance and do not induce vomiting unless instructed by medical personnel.

How should DOTP spills be handled?
Contain the liquid, prevent entry to drains, recover large quantities where safe and absorb remaining residues with suitable material for lawful disposal.

How should DOTP be stored?
Store the approved grade in tightly closed, clearly labeled containers away from moisture, excessive heat and incompatible strong oxidizers.

What is the shelf life of DOTP?
The shelf life of Plasticizer DOTP depends on the purchased grade and storage conditions; one published grade specifies one year below 40 °C when moisture is excluded.

Can DOTP be stored outdoors?
Only if the container and storage system are qualified to protect the purchased grade from excess heat, water and contamination in the local environment.

Is DOTP regulated as dangerous goods for transport?
A published neat-DOTP SDS lists it as not classified for US DOT, IMDG and IATA/ICAO; classification of the actual shipment must be confirmed.

What UN number applies to DOTP?
The cited non-dangerous-goods SDS does not assign a dangerous-goods UN number for the representative product.

Is DOTP biodegradable?
A published SDS reports ready biodegradability under its referenced test, but environmental handling and spill prevention remain necessary.

Can DOTP be poured into drains?
No. Industrial DOTP releases should be controlled and waste should be handled according to local environmental regulations.

Is DOTP a drop-in replacement for every ortho-phthalate?
No. Differences in gelation, efficiency, migration, aging, compatibility and regulatory requirements mean that each substitution needs validation.

What should be specified when purchasing DOTP?
Specify CAS identity, approved grade, performance and impurity requirements, relevant TDS/SDS/COA documentation, packaging and intended-use constraints.

Can Ataman Kimya provide DOTP information?
Customers may contact Ataman Kimya to discuss intended applications, technical documentation, grade requirements, packaging options, present availability and quotation requests without assuming any particular stock.

TECHNICAL SUMMARY

Plasticizer DOTP is bis(2-ethylhexyl) terephthalate, CAS 6422-86-2 and EC 229-176-9, an aromatic diester primarily used as an external plasticizer in flexible PVC. Its distinguishing chemical feature is the para-substituted terephthalate core, which makes it a structural isomer of, but not chemically identical to, ortho-phthalate DEHP.

Plasticizer DOTP is a high-boiling, low-volatility, nearly colorless liquid with an approximate molecular mass of 390.56 g/mol. Representative published product documentation gives liquid density around 0.982 g/cm3 at 20 °C and dynamic viscosity about 65.8 mPa·s at 25 °C, together with grade-specific limits for ester content, acid number, water and color. The precise acceptance figures should come from the contracted grade specification and COA.

Plasticizer DOTP can support flexible PVC manufacturing in cable compounds, vinyl films, coated textiles, plastisols, flooring, wall coverings, gaskets and selected consumer or industrial articles. Performance depends on PVC resin characteristics, other ingredients, plasticizer loading, processing history and finished-article service conditions. Low vapor pressure does not eliminate all migration, extraction or regulatory obligations.

Procurement and processing should be supported by a current SDS, a suitable TDS and batch-specific quality documents. End-use claims such as food contact, medical devices or toy suitability require application- and jurisdiction-specific review instead of reliance on the word “non-phthalate.”

CONTACT ATAMAN KIMYA

Customers considering Plasticizer DOTP for PVC compounding, plastisol manufacture, flexible film, wire and cable or other eligible applications may contact Ataman Kimya to discuss their required performance profile and purchasing criteria. It may be useful to share the intended end use, resin system, target properties, required test methods and any regulatory or impurity restrictions so that suitable documentation and grade options can be discussed.

Ataman Kimya may be contacted regarding technical documentation, packaging options, current availability, supply requirements and a quotation. Product grades, stock, certifications and delivery arrangements should be confirmed directly rather than assumed from this general chemical profile.

Ataman Chemicals
Phone: +90 216 577 10 10
Email: info@atamankimya.com