BBP BUTYL BENZYL PHTHALATE

BBP Butyl Benzyl Phthalate is an ortho-phthalate ester historically used as a high-solvating plasticizer and processing aid in flexible polymer, coating, adhesive, sealant and rubber formulations. BBP Butyl Benzyl Phthalate is a clear, oily liquid with CAS Number 85-68-7, EC Number 201-622-7, molecular formula C19H20O4 and molecular weight approximately 312.36 g/mol. BBP Butyl Benzyl Phthalate has low volatility, relatively high density, low water solubility and strong affinity for organic polymer phases, properties that historically made the substance effective in flexible PVC, flooring, coated fabrics, adhesives, sealants, paints and related plasticized systems. Because BBP Butyl Benzyl Phthalate is classified as toxic to reproduction and very toxic to aquatic life, and because modern regulations substantially restrict many uses, current application decisions must begin with a jurisdiction-specific regulatory check rather than assuming that legacy plasticizer uses remain legally available.

PRODUCT IDENTITY

Chemical Name: Butyl Benzyl Phthalate
Common Abbreviation: BBP
CAS Number: 85-68-7
EC Number: 201-622-7
CLP Index Number: 607-430-00-3
PubChem CID: 2347
Molecular Formula: C19H20O4
Molecular Weight: Approximately 312.36 g/mol
Chemical Class: Ortho-phthalate diester / phthalate plasticizer
Chemical Description: Mixed butyl and benzyl ester of phthalic acid
IUPAC Name: 2-O-benzyl 1-O-butyl benzene-1,2-dicarboxylate
Alternative Systematic Name: 1,2-Benzenedicarboxylic acid, 1-butyl 2-(phenylmethyl) ester
Physical Form: Clear, oily liquid
Odor: Mild
Color: Typically colorless to very pale
Density: Approximately 1.10-1.12 g/cm³ around room temperature
Specific Gravity: Approximately 1.12 at about 20°C
Melting Point: Approximately below -35°C
Boiling Point: Approximately 370°C at atmospheric pressure in widely cited reference data
Flash Point: Approximately 110-113°C closed cup in reviewed physical-property data; older fire-response references report about 199°C under a different test basis
Autoignition Temperature: Approximately 233°C in older fire-response data
Vapor Pressure: Very low at room temperature, on the order of 10^-5 mmHg
Vapor Density: Approximately 10.8 relative to air
Water Solubility: Low, commonly reported around 2-3 mg/L at room temperature
Log Kow: Approximately 4.4-4.9 depending on source and method
Typical Viscosity: Approximately 55 cP in reviewed physical-property data
Primary Historical Function: External plasticizer
Primary Historical Polymer Compatibility: Flexible PVC and related polar polymer systems
Current Regulatory Character: Highly restricted in many jurisdictions because of reproductive-toxicity and endocrine-disruption concerns
Transport Character: Environmentally hazardous liquid classification may apply under current transport rules; current SDS controls formal transport assignment

SYNONYMS

Butyl Benzyl Phthalate, Benzyl Butyl Phthalate, BBP, n-Butyl Benzyl Phthalate, Benzyl n-Butyl Phthalate, Butylbenzyl Phthalate, Benzylbutyl Phthalate, Phthalic Acid Benzyl Butyl Ester, Phthalic Acid Butyl Benzyl Ester, Phthalic Acid n-Butyl Benzyl Ester, Phthalic Acid Benzyl n-Butyl Ester, 1,2-Benzenedicarboxylic Acid, Butyl Phenylmethyl Ester, 1,2-Benzenedicarboxylic Acid, 1-Butyl 2-(Phenylmethyl) Ester, 1,2-Benzenedicarboxylic Acid, Butyl Benzyl Ester, 1,2-Benzenedicarboxylic Acid, Benzyl Butyl Ester, Butyl Phenylmethyl 1,2-Benzenedicarboxylate, Benzyl Butyl Benzene-1,2-Dicarboxylate, Butyl Benzyl Benzene-1,2-Dicarboxylate, 2-O-Benzyl 1-O-Butyl Benzene-1,2-Dicarboxylate, Butyl 2-(Phenylmethyl) Phthalate, Benzyl Butyl 1,2-Benzenedicarboxylate, Butyl Benzyl 1,2-Benzenedicarboxylate, Butyl Benzyl Orthophthalate, Benzyl Butyl Orthophthalate, Mixed Butyl Benzyl Phthalate Ester, Butyl/Benzyl Phthalate, BBP Plasticizer, Butyl Benzyl Phthalate Plasticizer, Benzyl Butyl Phthalate Plasticizer, Phthalic Acid Butyl Phenylmethyl Ester

WHAT IS BBP BUTYL BENZYL PHTHALATE?

BBP Butyl Benzyl Phthalate is a mixed phthalate ester produced from phthalic-acid chemistry with one butyl ester group and one benzyl ester group.
The asymmetrical ester structure gives BBP Butyl Benzyl Phthalate a balance of solvating power, compatibility and permanence that historically made the substance useful as an external plasticizer.
An external plasticizer is blended physically into a polymer rather than becoming chemically bonded to the polymer backbone.
BBP Butyl Benzyl Phthalate therefore lowers intermolecular attraction between polymer chains, increases segmental mobility and reduces stiffness.
The result can be increased flexibility, softer feel, improved low-temperature behavior and easier processing.
Because the plasticizer is not chemically attached to the polymer, migration, extraction and environmental release remain important technical and regulatory considerations.

CHEMICAL STRUCTURE

BBP Butyl Benzyl Phthalate contains a benzene-1,2-dicarboxylate core with two different ester groups.
One ester is derived from n-butanol and the other from benzyl alcohol.
This mixed-ester structure distinguishes BBP Butyl Benzyl Phthalate from symmetrical phthalates such as dibutyl phthalate or bis(2-ethylhexyl) phthalate.
The aromatic phthalate core contributes polarity and compatibility with many polar polymer matrices.
The butyl and benzyl groups contribute hydrophobic character and help control viscosity, solvency and permanence.
The molecular structure is nonionic and electrically neutral under normal conditions.

PHYSICAL PROPERTIES

BBP Butyl Benzyl Phthalate is normally a clear, oily liquid at room temperature.
The density is greater than water, commonly around 1.10-1.12 g/cm³.
The melting point is below approximately -35°C, so the material remains liquid under ordinary storage conditions.
The normal boiling point is widely reported around 370°C.
Low room-temperature vapor pressure means BBP Butyl Benzyl Phthalate is substantially less volatile than conventional low-boiling solvents.
The combination of high boiling point and low vapor pressure historically supported use in long-life plasticized polymer products.

VISCOSITY

Reviewed physical-property data include a viscosity near 55 cP under the cited test condition.
Viscosity changes with temperature and therefore affects pumping, blending and metering.
Warmer material flows more easily, while colder material becomes more viscous.
Process temperature should be selected to improve handling without creating unnecessary thermal exposure.
Viscosity should be checked against the product-specific COA where a narrow production specification is required.

DENSITY AND SPECIFIC GRAVITY

BBP Butyl Benzyl Phthalate has a density of approximately 1.10-1.12 g/cm³ around room temperature.
Because the density is greater than water, spilled liquid can sink beneath the water surface rather than forming only a floating layer.
Density is also important for volumetric metering and converting between mass and volume during formulation.
Weight-based dosing is generally more accurate than volume-based dosing when temperature varies.
Product-specific density should be confirmed on the current TDS or COA for precision manufacturing.

BOILING POINT AND VOLATILITY

The boiling point of BBP Butyl Benzyl Phthalate is commonly reported around 370°C at atmospheric pressure.
Room-temperature vapor pressure is extremely low compared with ordinary solvents.
Low volatility improves plasticizer retention during polymer processing and service.
Low volatility does not eliminate exposure because BBP Butyl Benzyl Phthalate can migrate into dust, surfaces, food-contact environments or other materials through physical transfer.
Heating during processing can increase vapor generation and should be controlled by ventilation and temperature management.

FLASH POINT

Reviewed modern physical-property data place the flash point of BBP Butyl Benzyl Phthalate around 110-113°C by closed-cup methods.
Older emergency-response references have reported a substantially higher value under a different test basis.
The current product-specific SDS should therefore control formal flash-point labeling and transport handling.
BBP Butyl Benzyl Phthalate is a high-boiling combustible organic liquid rather than a highly volatile flammable solvent.
Hot processing equipment, ignition sources and contaminated absorbents should still be managed under appropriate industrial fire controls.

WATER SOLUBILITY

BBP Butyl Benzyl Phthalate has low water solubility, with commonly reviewed values around 2-3 mg/L at room temperature.
Low water solubility reflects the large hydrophobic organic structure and relatively high octanol/water partition coefficient.
The small dissolved fraction can still be environmentally significant because BBP Butyl Benzyl Phthalate is very toxic to aquatic life.
Spill control should therefore focus on preventing discharge to drains, soil, surface water and groundwater.
Water should not be considered an effective cleanup medium for bulk liquid BBP Butyl Benzyl Phthalate.

OCTANOL WATER PARTITIONING

BBP Butyl Benzyl Phthalate has a relatively high log Kow, commonly reported in the approximate 4.4-4.9 range.
This indicates strong affinity for organic phases relative to water.
High hydrophobicity supports compatibility with many polymer matrices but also contributes to environmental partitioning behavior.
The substance can associate with organic matter, sediments and lipid-rich phases.
Environmental assessment should therefore consider more than simple water solubility.

PLASTICIZER MECHANISM

BBP Butyl Benzyl Phthalate historically functioned primarily as an external plasticizer.
The molecules position themselves between polymer chains and weaken polymer-polymer intermolecular interactions.
This increases free volume and chain mobility.
The polymer becomes softer, more flexible and easier to process.
Plasticizer level controls properties such as hardness, tensile modulus, elongation, low-temperature flexibility and melt-processing behavior.
Because BBP Butyl Benzyl Phthalate is not covalently bound, permanence depends on migration, volatility, extraction resistance and compatibility with the polymer.

PVC COMPATIBILITY

Flexible PVC was historically the most important polymer application for BBP Butyl Benzyl Phthalate.
The polar ester groups provide strong solvating interaction with PVC.
The benzyl-containing structure historically gave BBP Butyl Benzyl Phthalate strong solvency and efficient plasticization.
Good compatibility helped produce uniform flexible compounds when the plasticizer level and stabilizer package were properly balanced.
Current use in plasticized PVC must be evaluated against applicable restrictions because BBP Butyl Benzyl Phthalate is now heavily regulated in many article categories and jurisdictions.

PROCESSING BEHAVIOR

A strong-solvating plasticizer can reduce the processing temperature needed to achieve fusion in compatible polymer compounds.
BBP Butyl Benzyl Phthalate historically helped promote efficient PVC gelation and fusion.
Lower compound viscosity can improve calendering, coating and extrusion.
Processing benefits must be balanced against migration, emissions, regulatory status and final-use restrictions.
Modern formulations often use alternative plasticizer technologies where BBP Butyl Benzyl Phthalate is restricted or commercially undesirable.

APPLICATIONS

Flexible PVC compounds
BBP Butyl Benzyl Phthalate was historically used as a primary or co-plasticizer in flexible PVC because of strong solvency and efficient flexibility development. Current use must comply with all applicable article, workplace and market restrictions.

Vinyl flooring
Floor coverings were among the major historical BBP Butyl Benzyl Phthalate applications. The plasticizer provided flexibility, processing efficiency and useful mechanical balance, but many current markets restrict or avoid BBP Butyl Benzyl Phthalate in such articles.

Resilient flooring
BBP Butyl Benzyl Phthalate historically contributed softness and flex response in resilient vinyl flooring systems.

Floor tiles
Plasticized vinyl floor tiles historically used phthalate plasticizers to control flexibility and processing.

Vinyl sheet flooring
Sheet flooring was another major historical plasticized-PVC use area.

Artificial leather
BBP Butyl Benzyl Phthalate was historically used in flexible vinyl artificial-leather formulations where softness and surface flexibility were required.

Coated fabrics
PVC-coated fabrics historically used BBP Butyl Benzyl Phthalate to improve flexibility and coating-process behavior.

Vinyl upholstery
Plasticized vinyl upholstery applications historically benefited from the strong solvating and softening action of BBP Butyl Benzyl Phthalate.

Flexible films
Selected flexible vinyl films historically used BBP Butyl Benzyl Phthalate, although modern restrictions can prohibit or discourage use depending on the 
article.

Flexible sheeting
Plasticized PVC sheeting historically used BBP Butyl Benzyl Phthalate where a balance of flexibility and processing was required.

Calendered vinyl
BBP Butyl Benzyl Phthalate historically improved fusion and flow in calendered PVC formulations.

Plastisol formulations
Strong solvency historically made BBP Butyl Benzyl Phthalate useful in selected plastisol systems where gelation and viscosity balance were important.

Vinyl coatings
Plasticized PVC coatings historically used BBP Butyl Benzyl Phthalate to control film flexibility and application behavior.

Adhesives
BBP Butyl Benzyl Phthalate has been used as a plasticizing and solvating component in adhesive formulations. Current product design should confirm 
regulatory acceptability before use.

Construction adhesives
Historical adhesive uses included construction formulations requiring flexibility and compatibility with polymeric binders.

Flooring adhesives
Floor-covering systems historically used phthalate plasticizers in some adhesive formulations.

Sealants
BBP Butyl Benzyl Phthalate has been used as a plasticizing component in sealants to reduce hardness and improve flexibility.

Caulks
Flexible caulk formulations historically used phthalate plasticizers to adjust rheology and cured softness.

Mastics
BBP Butyl Benzyl Phthalate can provide plasticization and solvency in compatible mastic formulations where legally permitted.

Paints
Selected paint formulations historically used BBP Butyl Benzyl Phthalate as a plasticizer or film-flexibility modifier.

Coatings
BBP Butyl Benzyl Phthalate has been used in coatings where additional flexibility and improved film formation were required.

Lacquers
Phthalate plasticizers historically served as film-flexibility modifiers in selected lacquer technologies.

Nitrocellulose coatings
BBP Butyl Benzyl Phthalate has historical use as a plasticizer in compatible cellulose-based coating systems.

Acrylic coatings
Selected acrylic formulations can be plasticized by phthalate esters, subject to compatibility and current regulatory restrictions.

Rubber products
BBP Butyl Benzyl Phthalate has been used as a plasticizing or processing component in certain rubber formulations.

Synthetic rubber
Selected polar synthetic rubbers can incorporate BBP Butyl Benzyl Phthalate as a softening or processing aid where compatibility is suitable.

Polymeric seal systems
Flexible polymer systems historically used BBP Butyl Benzyl Phthalate to lower modulus and improve conformability.

Wire and cable compounds
Flexible PVC wire and cable technology historically used phthalate plasticizers, although BBP Butyl Benzyl Phthalate use must now be checked against 
electrical-equipment and article restrictions.

Electrical insulation compounds
Plasticized vinyl insulation historically relied on phthalates for flexibility and processability.

Gaskets
Flexible polymeric gaskets can use compatible plasticizers to adjust hardness and compression behavior.

Flexible profiles
Extruded flexible PVC profiles historically used phthalate plasticizers to improve processability and final softness.

Extruded tubing
Flexible tubing historically used plasticizers in PVC and related formulations, but BBP Butyl Benzyl Phthalate is unsuitable for many modern regulated end uses.

Conveyor-belt components
Selected flexible polymer and rubber systems historically used BBP Butyl Benzyl Phthalate as a plasticizing ingredient.

Underbody coatings
Flexible protective formulations have historically used plasticizers to resist cracking and vibration.

Automotive interior vinyl
Legacy automotive vinyl formulations used phthalates for softness and processability, while modern restricted-substance programs often exclude BBP Butyl 
Benzyl Phthalate.

Printing inks
Selected ink technologies historically used phthalate plasticizers to adjust binder flexibility and film properties.

Polymer dispersions
BBP Butyl Benzyl Phthalate can act as a hydrophobic plasticizing component in compatible polymer-binder systems where legally and technically acceptable.

Resin modification
BBP Butyl Benzyl Phthalate has been used to reduce brittleness in compatible resin systems.

Processing aid
The material can reduce compound viscosity and improve polymer fusion in compatible formulations.

Laboratory reference formulations
BBP Butyl Benzyl Phthalate remains relevant in analytical, regulatory, toxicological and legacy-formulation research even where commercial article use is 
restricted.

Legacy product replacement studies
Formulators may use BBP Butyl Benzyl Phthalate as a benchmark when comparing replacement plasticizers for solvency, hardness, migration and process behavior.

HISTORICAL VERSUS CURRENT USE

Many BBP Butyl Benzyl Phthalate applications are best described as historical or legacy uses rather than default modern recommendations.
Regulatory restrictions have significantly changed the commercial landscape for BBP Butyl Benzyl Phthalate.
A technically suitable application can still be legally restricted or commercially unacceptable.
This distinction is especially important in toys, childcare articles, electrical and electronic equipment, consumer articles, food-related applications and products intended for sensitive populations.
Current product development should therefore perform regulatory screening before formulation work begins.

FLEXIBLE PVC FORMULATION

In flexible PVC, the amount of plasticizer strongly influences hardness, tensile modulus, elongation and low-temperature flexibility.
BBP Butyl Benzyl Phthalate historically provided strong solvency and efficient plasticization.
The plasticizer can be used alone or historically in combination with other plasticizers to balance solvency, permanence, viscosity and cost.
Stabilizers, fillers, pigments, lubricants and processing aids can all modify the apparent plasticizer demand.
Modern formulation should not simply reproduce legacy BBP Butyl Benzyl Phthalate levels without first confirming legal use and customer restricted-substance requirements.

SOLVATING POWER

BBP Butyl Benzyl Phthalate historically gained value from high solvating power toward PVC and other polar polymer phases.
Strong solvency promotes rapid gelation and fusion of PVC particles during heating.
The benzyl group contributes to the overall polarity and aromatic character of the molecule.
Efficient solvency can reduce fusion temperature or processing time in suitable formulations.
High solvency can also change plastisol viscosity and storage behavior, so the total plasticizer blend should be optimized experimentally.

PLASTICIZER EFFICIENCY

Plasticizer efficiency describes how effectively a given amount of plasticizer reduces polymer hardness or modulus.
BBP Butyl Benzyl Phthalate historically provided efficient plasticization in PVC.
Efficiency should be evaluated at equal compound hardness or equal mechanical target rather than by comparing only phr levels.
Different plasticizers can deliver the same Shore hardness while producing different tensile, migration, volatility and low-temperature properties.
Replacement studies should therefore compare the full performance profile rather than a single hardness value.

PERMANENCE

Plasticizer permanence describes resistance to loss by volatility, migration, extraction or diffusion.
BBP Butyl Benzyl Phthalate has relatively low volatility because of its high boiling point and low vapor pressure.
Low volatility does not guarantee low migration because diffusion into adjacent materials remains possible.
Extraction can occur through oils, solvents, detergents or contacting polymer layers depending on service conditions.
Long-term product design should test migration and extraction under the actual temperature and contact environment.

MIGRATION

BBP Butyl Benzyl Phthalate is not chemically bonded to the polymer and can migrate over time.
Migration can lead to surface tack, staining, contamination of adjacent layers or gradual hardening of the original plasticized polymer.
The rate depends on plasticizer concentration, polymer compatibility, temperature, thickness and the nature of contacting materials.
Higher service temperature generally accelerates diffusion.
Modern restricted-substance programs and sensitive-contact applications often favor plasticizers with improved permanence or alternative chemistry.

EXTRACTION RESISTANCE

Extraction resistance is important where a plasticized polymer contacts water, detergents, oils, fuels or solvents.
BBP Butyl Benzyl Phthalate has low water solubility but can still be removed by organic media or surfactant-containing liquids.
The polymer matrix can strongly influence extraction behavior.
Extraction testing should reproduce the actual contacting medium, temperature and exposure duration.
Mass loss, hardness change and mechanical-property change can all be useful evaluation criteria.

LOW-TEMPERATURE PERFORMANCE

Plasticization reduces the glass-transition temperature and increases polymer-chain mobility at lower temperatures.
BBP Butyl Benzyl Phthalate historically improved flexibility of PVC relative to unplasticized material.
Low-temperature performance depends on both plasticizer concentration and molecular compatibility.
A plasticizer that performs well at room temperature can still show different cold-flex properties from another plasticizer at equal hardness.
Cold-bend, brittle-temperature or dynamic-mechanical testing can be used when low-temperature flexibility is critical.

VOLATILITY

BBP Butyl Benzyl Phthalate is substantially less volatile than conventional coating solvents.
The very low room-temperature vapor pressure reduces evaporation from polymer compounds under ordinary conditions.
At elevated processing temperatures, emissions can increase and ventilation remains necessary.
Long-term loss from plasticized articles is governed not only by vapor pressure but also by diffusion through the polymer matrix.
Thermal-aging tests can help quantify weight loss and property change.

COMPATIBILITY

Compatibility is one of the most important requirements for a successful external plasticizer.
BBP Butyl Benzyl Phthalate historically showed strong compatibility with PVC and several polar resin systems.
Poor compatibility can produce exudation, hazing, surface oiling or phase separation.
Compatibility should be assessed at the intended loading and service temperature.
Polymer grade, molecular weight, filler package and co-plasticizers can all influence the compatibility limit.

FILLERS AND PIGMENTS

Mineral fillers such as calcium carbonate, silica, clay and barytes can change the amount of plasticizer required for a target compound consistency.
High-surface-area filler can adsorb part of the liquid plasticizer and increase compound viscosity.
Pigment surfaces can also influence rheology and dispersion.
BBP Butyl Benzyl Phthalate historically served as part of the liquid phase used to wet fillers and pigments in PVC and coating formulations.
Modern formulations should evaluate whether a permitted alternative plasticizer provides similar filler-wetting and process behavior.

PLASTISOL RHEOLOGY

Plasticizer selection has a strong effect on plastisol viscosity, aging and gelation.
A highly solvating plasticizer can accelerate PVC particle swelling during storage.
This can improve fusion but may also increase plastisol viscosity over time.
BBP Butyl Benzyl Phthalate historically contributed strong solvating action in suitable plastisol systems.
Viscosity should therefore be measured both immediately after preparation and after defined storage periods.

ADHESIVE FORMULATION

In adhesives, BBP Butyl Benzyl Phthalate can reduce binder hardness and improve flexibility.
Plasticizer can also adjust open time, tack, viscosity and stress distribution in the cured or dried adhesive film.
Excess plasticizer can reduce cohesive strength and heat resistance.
Migration into adjacent substrates can affect long-term bond performance.
Current adhesive development should verify both regulatory acceptability and compatibility with the binder system.

SEALANT FORMULATION

Sealants require a balance between flexibility, cohesive strength, adhesion and resistance to creep.
BBP Butyl Benzyl Phthalate historically served as a softening component in selected sealant and caulk formulations.
The plasticizer can lower modulus and improve movement accommodation.
Excessive loading can increase migration, staining or surface tack.
Modern sealant technology frequently uses alternative plasticizers where phthalate restrictions or low-migration requirements apply.

COATINGS AND PAINTS

BBP Butyl Benzyl Phthalate historically served as a film-flexibility modifier in selected coatings and paints.
Plasticizer can reduce cracking in brittle resin films and improve bend performance.
The tradeoff can include lower block resistance, reduced hardness or increased dirt pickup if the level is too high.
Migration can also affect recoating or adjacent materials.
Current coatings should be reviewed for regulatory restrictions and customer exclusion lists before BBP Butyl Benzyl Phthalate is considered.

RUBBER AND ELASTOMER USE

Certain rubber and elastomer formulations can use ester plasticizers as processing aids or softeners.
BBP Butyl Benzyl Phthalate compatibility depends on rubber polarity and cure system.
Plasticizer can reduce compound viscosity and improve filler dispersion.
The final effect on tensile strength, elongation, compression set and extraction resistance should be tested.
Current restricted-substance requirements may make alternative plasticizers preferable.

SAFETY PROFILE

BBP Butyl Benzyl Phthalate is not appropriately described as a low-hazard conventional plasticizer.
Current harmonized European classification includes Reproductive Toxicity Category 1B.
The harmonized hazard statement is H360Df, indicating danger to the unborn child and suspected damage to fertility.
BBP Butyl Benzyl Phthalate is also classified as very toxic to aquatic life and very toxic to aquatic life with long-lasting effects.
Current handling should therefore minimize worker exposure and prevent environmental release.
The current product-specific SDS should control labeling, PPE, occupational controls and emergency response.

REPRODUCTIVE TOXICITY

BBP Butyl Benzyl Phthalate is classified in the European Union as Reproductive Toxicity Category 1B.
This classification reflects a high level of concern for reproductive and developmental effects.
Current regulatory assessment identifies BBP Butyl Benzyl Phthalate as toxic for reproduction and the substance is also recognized for endocrine-disrupting properties relevant to human health.
Pregnancy-related and reproductive-risk controls should therefore be part of occupational risk assessment.
Closed transfer, engineering controls, appropriate gloves and strict hygiene can help minimize workplace contact.
Formal workplace controls should follow the current SDS and applicable occupational regulations.

ENDOCRINE DISRUPTION

BBP Butyl Benzyl Phthalate is recognized in current European regulatory frameworks for endocrine-disrupting properties relevant to human health.
Endocrine disruption is distinct from ordinary acute irritation and relates to interference with hormonal signaling and biological development.
This regulatory concern is one of the reasons many modern applications have shifted toward alternative plasticizer chemistry.
Current product development should not treat BBP Butyl Benzyl Phthalate as interchangeable with unrestricted general-purpose plasticizers.

AQUATIC HAZARD

BBP Butyl Benzyl Phthalate is classified as very toxic to aquatic life.
The substance is also classified as very toxic to aquatic life with long-lasting effects.
Even though water solubility is low, the dissolved fraction and environmental partitioning can create significant aquatic risk.
Spills should be contained before the material reaches drains, surface water or soil.
Contaminated absorbents and wash materials should be handled as controlled waste under applicable regulations.

CURRENT UNITED STATES RISK EVALUATION

A final U.S. federal risk evaluation released in December 2025 concluded that BBP Butyl Benzyl Phthalate presents unreasonable risk to human health for two evaluated worker conditions of use and unreasonable risk to the environment for seven evaluated conditions of use.
This finding is important because it can lead to risk-management requirements affecting specific uses or workplace practices.
The current legal status of any U.S. condition of use should therefore be checked before commercial formulation, supply or import decisions.
Historical market availability should not be treated as evidence that every use remains unrestricted.

EU AUTHORISATION STATUS

BBP Butyl Benzyl Phthalate is included on the European REACH Authorisation List.
The substance was included because of reproductive toxicity and endocrine-disrupting properties relevant to human health.
The original sunset date was 21 February 2015, with later transitional dates for certain narrow derogated uses.
Use in the European Union can therefore require specific authorization unless an exemption applies.
Current legal review should be completed before BBP Butyl Benzyl Phthalate is used, imported or supplied for an EU application.

EU ARTICLE RESTRICTIONS

European restrictions significantly limit BBP Butyl Benzyl Phthalate in plasticized articles.
Current restrictions generally prohibit placing many articles on the market when BBP Butyl Benzyl Phthalate, together with the other listed restricted phthalates, reaches or exceeds 0.1% by weight of the plasticized material, subject to specified exemptions.
Toys and childcare articles are subject to particularly strict restrictions.
Article-specific exemptions and definitions matter, so the exact legal text should be reviewed for the intended product.
These restrictions make many historical consumer PVC applications commercially unsuitable for BBP Butyl Benzyl Phthalate today.

ELECTRICAL AND ELECTRONIC EQUIPMENT

European RoHS rules set a maximum concentration value of 0.1% for BBP Butyl Benzyl Phthalate in homogeneous materials of covered electrical and electronic equipment, subject to scope and exemptions.
This restriction is highly relevant to wire, cable, insulation, flexible polymer parts and electronic assemblies.
A legacy formulation that performs well technically may therefore fail present restricted-substance requirements.
Current compliance declarations and analytical testing should be used where electrical or electronic applications are involved.

CHILDREN'S PRODUCTS

United States consumer-product rules prohibit children's toys and childcare articles containing more than 0.1% BBP Butyl Benzyl Phthalate in covered accessible components.
European rules also restrict BBP Butyl Benzyl Phthalate in toys and childcare articles.
BBP Butyl Benzyl Phthalate should therefore not be promoted as a plasticizer for modern children's products.
Any legacy reference to toy or childcare applications should be treated as obsolete unless a specific current exemption is demonstrated.

REGULATORY POSITIONING

BBP Butyl Benzyl Phthalate is a technically effective legacy plasticizer with substantial modern regulatory constraints.
Current product pages should distinguish technical function from legal availability.
Regulatory status varies by jurisdiction, concentration, article type and condition of use.
Customer restricted-substance lists can be stricter than statutory minimum requirements.
Ataman Chemicals recommends verifying current market-specific requirements before formulation, sampling, quotation or supply.

ENVIRONMENTAL FATE

BBP Butyl Benzyl Phthalate has low vapor pressure and low water solubility but a relatively high organic-phase affinity.
The substance can partition into soils, sediments, organic matter and polymeric surfaces.
Environmental release can occur through manufacturing losses, product wear, migration, dust and disposal.
Low volatility does not prevent environmental transport.
Spill and waste controls should focus on containment and prevention of release to aquatic environments.

SPILL MANAGEMENT

Stop the source of the BBP Butyl Benzyl Phthalate release when this can be done safely.
Prevent entry into drains, sewers, soil and surface water.
Use compatible inert absorbent for small spills and mechanical recovery for larger liquid releases where appropriate.
Because the liquid is denser than water, a release to water can behave differently from a light hydrocarbon spill.
Recovered liquid and contaminated absorbent should be placed in suitable labeled containers.
Environmental authorities may need to be notified depending on spill quantity and jurisdiction.

HANDLING AND STORAGE

BBP Butyl Benzyl Phthalate should be handled in closed or well-controlled systems where practical.
Avoid skin contact, eye contact and unnecessary inhalation of heated vapor or aerosol.
Use chemical-resistant gloves, protective clothing and suitable eye protection selected through workplace risk assessment.
Store in tightly closed compatible containers away from strong oxidizing agents and uncontrolled heat.
Maintain good housekeeping to prevent contamination of floors, drains and surrounding surfaces.
Storage and transfer procedures should follow the current product-specific SDS.

FIRST AID

After skin contact, remove contaminated clothing and wash exposed skin thoroughly according to the current SDS.
After eye contact, rinse cautiously with clean water for an extended period and obtain medical advice as directed by the SDS.
If inhalation exposure occurs during heated processing or aerosol generation and symptoms develop, move the affected person to fresh air and seek medical attention.
After ingestion, follow the product-specific SDS and professional medical guidance.
Because reproductive toxicity is a principal hazard, occupational exposure incidents should be documented and managed under the applicable workplace health program.

FIRE RESPONSE

BBP Butyl Benzyl Phthalate is a high-boiling combustible organic ester.
Combustion can generate carbon oxides and irritating decomposition products.
Appropriate extinguishing media should be selected according to the surrounding fire and current SDS.
Firefighters may require self-contained breathing apparatus and protective clothing.
Containers exposed to fire can heat and should be managed according to emergency-response procedures.
The current SDS should control the formal flash point and firefighting instructions for the supplied grade.

INCOMPATIBILITIES

BBP Butyl Benzyl Phthalate is an ester and should be kept away from strong oxidizing agents.
Strong oxidizing acids can react vigorously with organic ester materials.
Strong caustic conditions can promote ester hydrolysis and generate heat.
Reactive alkali metals and hydrides are incompatible with ester-containing materials.
Industrial storage should segregate BBP Butyl Benzyl Phthalate from incompatible reactive chemicals according to the current SDS.

QUALITY CONTROL

Important BBP Butyl Benzyl Phthalate quality-control parameters include identity, appearance, color, ester purity, density, viscosity, acid value, water content and volatile impurities.
CAS Number 85-68-7 and molecular formula C19H20O4 should remain consistent across product documents.
Density around 1.10-1.12 g/cm³ provides a useful secondary identity check.
Viscosity and color can reveal contamination or product degradation.
Low water content is important for stable handling and compatibility in moisture-sensitive formulations.
The exact acceptance limits should be taken from the Ataman Chemicals specification and batch COA.

ACID VALUE

Acid value is an important quality parameter for phthalate ester plasticizers because residual acidity can influence polymer stability and processing.
A low acid value generally indicates good esterification and purification.
Elevated acidity can accelerate hydrolysis, interfere with stabilizer systems or contribute to corrosion of sensitive processing equipment.
The product-specific specification should define the maximum acceptable acid value.
Acid value should be tested using a consistent analytical method for meaningful batch comparison.

WATER CONTENT

Water content should be controlled in BBP Butyl Benzyl Phthalate.
Excess water can affect compatibility, storage appearance and moisture-sensitive downstream formulations.
Water can also complicate certain adhesive, coating and polymer-processing systems.
A product-specific Karl Fischer or equivalent moisture specification can be used where required.
Containers should remain tightly closed to limit atmospheric contamination.

COLOR

BBP Butyl Benzyl Phthalate is normally clear and colorless to very pale.
Increasing yellow or brown color can indicate thermal history, oxidation, contamination or raw-material variation.
Color is especially important in light-colored polymer, coating and adhesive formulations.
Product-specific APHA or Hazen color limits should be used where appearance is critical.

COMMON FORMULATION PROBLEMS

Plasticized PVC becomes too soft
Plasticizer loading may be excessive for the target hardness. Reduce total plasticizer or rebalance with a less efficient plasticizer where legally permitted.

Plasticized PVC remains too hard
Plasticizer level, polymer grade or filler loading may be too low for the target flexibility. Recalculate the plasticizer-to-resin balance.

Plasticizer migrates to the surface
The loading can exceed compatibility limits or service temperature can accelerate diffusion. Reduce plasticizer level or select a higher-permanence alternative.

Adjacent material becomes stained
BBP Butyl Benzyl Phthalate can migrate into contacting materials. Use barrier layers or a lower-migration plasticizer.

Compound loses flexibility after aging
Plasticizer can be lost through migration, extraction or volatilization. Evaluate permanence under actual service conditions.

Plastisol viscosity rises during storage
Strong solvency can promote PVC particle swelling. Rebalance the plasticizer blend and monitor viscosity aging.

Plastisol viscosity is too low
Plasticizer level or solvating balance may be excessive. Adjust resin-to-plasticizer ratio and rheology modifiers.

Fusion occurs too quickly
A highly solvating plasticizer can accelerate gelation. Use a less aggressive plasticizer blend or modify heating conditions.

Fusion is incomplete
Processing temperature, resin grade or plasticizer solvency may be inadequate. Verify the full fusion profile.

Coating film remains tacky
Excess plasticizer or poor binder compatibility can reduce hardness and increase surface tack. Lower the plasticizer level.

Sealant stains porous stone
Plasticizer migration can discolor adjacent porous materials. Use a low-migration sealant technology.

Adhesive loses cohesive strength
Excess plasticizer can soften the binder too strongly. Reduce plasticizer level or select a stronger binder.

Rubber compound has poor tensile strength
Over-plasticization can reduce modulus and strength. Rebalance plasticizer and filler loading.

Water extraction is unexpectedly high
Surfactants, elevated temperature or polymer morphology can increase extraction despite low intrinsic water solubility. Test the full compound under service 
conditions.

Oil extraction is high
Organic oils can dissolve or extract the plasticizer. Select a more extraction-resistant alternative.

Product shows haze
Water contamination, incompatible impurities or low-temperature conditions can affect appearance. Check moisture and purity.

Product color darkens
Heat, oxidation or contamination can increase color. Review storage and processing conditions.

Density is outside specification
Check temperature correction, contamination and product identity before use.

Viscosity is higher than expected
Low temperature or contamination can raise viscosity. Condition the material to the specified test temperature.

Viscosity is lower than expected
Excess temperature, dilution or product mix-up can reduce viscosity. Confirm density and identity.

Unexpected odor develops
Contamination or thermal degradation may be present. Hold the batch and review analytical quality.

Plasticizer blooms after cooling
Compatibility may be insufficient at the use level. Reduce loading or select a more compatible plasticizer.

Low-temperature flexibility is inadequate
BBP Butyl Benzyl Phthalate concentration or plasticizer blend may not meet the cold-flex target. Test an alternative plasticizer system.

High-temperature migration is excessive
Service temperature can accelerate diffusion. Select a higher-molecular-weight or polymeric plasticizer.

Wire or cable formulation fails restricted-substance testing
BBP Butyl Benzyl Phthalate is restricted in covered electrical and electronic applications. Replace the plasticizer with a compliant alternative rather than adjusting only process conditions.

Toy or childcare formulation contains BBP
BBP Butyl Benzyl Phthalate is restricted above applicable limits in toys and childcare articles. Use a permitted alternative.

EU article contains more than the permitted phthalate level
Current restrictions can prohibit BBP Butyl Benzyl Phthalate in plasticized articles at or above specified concentration thresholds. Review the applicable exemption or reformulate.

Customer requests phthalate-free material
BBP Butyl Benzyl Phthalate is an ortho-phthalate and cannot satisfy a phthalate-free requirement.

Customer requests SVHC-free material
BBP Butyl Benzyl Phthalate is an EU substance of very high concern and cannot satisfy an SVHC-free requirement.

Food-processing article proposed without compliance review
Technical plasticizer performance does not establish food-contact compliance. Verify all applicable legal restrictions before supply.

Plasticizer replacement gives different hardness
Alternative plasticizers have different efficiency. Compare at equal hardness or equal modulus rather than equal phr alone.

Plasticizer replacement changes fusion temperature
Solvating power differs across plasticizer chemistries. Adjust processing conditions and compound balance.

Plasticizer replacement changes viscosity
Viscosity and solvency of the replacement can alter plastisol and compound rheology. Re-optimize the formulation.

Material proposed for a sensitive consumer application
Reproductive-toxicity, endocrine-disruption and environmental classifications require a regulatory review before use.

FREQUENTLY ASKED QUESTIONS

What is BBP Butyl Benzyl Phthalate?
BBP Butyl Benzyl Phthalate is an ortho-phthalate diester historically used primarily as an external plasticizer.

What is the CAS Number?
85-68-7.

What is the EC Number?
201-622-7.

What is the molecular formula?
C19H20O4.

What is the molecular weight?
Approximately 312.36 g/mol.

What is the physical form?
A clear, oily liquid at room temperature.

What is the density?
Approximately 1.10-1.12 g/cm³ around room temperature.

What is the melting point?
Approximately below -35°C.

What is the boiling point?
Approximately 370°C at atmospheric pressure in widely cited reference data.

What is the flash point?
Reviewed modern data place the closed-cup flash point around 110-113°C; the current product-specific SDS should control the formal value.

What is the water solubility?
Low, commonly around 2-3 mg/L at room temperature.

What is the log Kow?
Commonly reported in the approximate 4.4-4.9 range.

What is the primary function of BBP Butyl Benzyl Phthalate?
Historically, the primary function was as an external plasticizer.

Was BBP Butyl Benzyl Phthalate used in PVC?
Yes. Flexible PVC was one of the major historical applications.

Was BBP Butyl Benzyl Phthalate used in flooring?
Yes. Vinyl and resilient flooring were major historical use areas.

Can BBP Butyl Benzyl Phthalate be used in adhesives?
It has historical adhesive use, but current regulatory restrictions must be checked before formulation or supply.

Can BBP Butyl Benzyl Phthalate be used in sealants?
It has historical use as a plasticizer in sealants and caulks, subject to present legal and customer restrictions.

Can BBP Butyl Benzyl Phthalate be used in paints and coatings?
Historically yes, as a flexibility modifier and plasticizer. Current use requires regulatory review.

Is BBP Butyl Benzyl Phthalate chemically bound to PVC?
No. It is an external plasticizer and remains physically incorporated rather than covalently bonded.

Can BBP Butyl Benzyl Phthalate migrate?
Yes. Migration and extraction are important performance and exposure considerations.

Is BBP Butyl Benzyl Phthalate volatile?
It has very low vapor pressure at room temperature, but emissions increase with heat and migration can occur without evaporation.

Is BBP Butyl Benzyl Phthalate classified for reproductive toxicity?
Yes. Current European harmonized classification includes Reproductive Toxicity Category 1B.

Is BBP Butyl Benzyl Phthalate an endocrine disruptor?
Current European regulatory frameworks recognize endocrine-disrupting properties relevant to human health.

Is BBP Butyl Benzyl Phthalate hazardous to aquatic life?
Yes. It is classified as very toxic to aquatic life with long-lasting effects.

Is BBP Butyl Benzyl Phthalate an EU SVHC?
Yes. BBP Butyl Benzyl Phthalate is included in the European authorization framework because of reproductive-toxicity and endocrine-disruption concerns.

Is BBP Butyl Benzyl Phthalate restricted in EU articles?
Yes. Current REACH restrictions significantly limit BBP Butyl Benzyl Phthalate in plasticized articles, subject to specified exemptions.

Is BBP Butyl Benzyl Phthalate restricted by RoHS?
Yes. Covered electrical and electronic equipment is subject to a 0.1% maximum concentration value in homogeneous materials, subject to scope and exemptions.

Can BBP Butyl Benzyl Phthalate be used in children's toys?
Modern U.S. and European rules restrict BBP Butyl Benzyl Phthalate in children's toys and childcare articles. It should not be treated as a normal plasticizer for these products.

What did the 2025 U.S. risk evaluation conclude?
The final federal evaluation concluded that BBP Butyl Benzyl Phthalate presents unreasonable risk to human health for two evaluated worker conditions of use and unreasonable risk to the environment for seven evaluated conditions of use.

Does BBP Butyl Benzyl Phthalate have one fixed molecular identity?
Yes. Unlike proprietary mixtures, BBP Butyl Benzyl Phthalate is a defined chemical substance with CAS Number 85-68-7 and formula C19H20O4.

What documents should be checked before use?
Use the current Ataman Chemicals TDS, SDS, COA and the current regulatory requirements for the intended market and application.

FINAL TECHNICAL SUMMARY

BBP Butyl Benzyl Phthalate is a defined ortho-phthalate diester with CAS Number 85-68-7, EC Number 201-622-7, molecular formula C19H20O4 and molecular weight approximately 312.36 g/mol.
The substance is a clear, oily liquid with density around 1.10-1.12 g/cm³, melting point below approximately -35°C, boiling point around 370°C, very low room-temperature vapor pressure and low water solubility.
BBP Butyl Benzyl Phthalate historically served primarily as an external plasticizer because it provides strong solvency and efficient flexibility development in compatible polymer systems.

Flexible PVC, flooring, coated fabrics, artificial leather, adhesives, sealants, paints, coatings and selected rubber systems were important historical application areas.
BBP Butyl Benzyl Phthalate is not covalently bound to the polymer and can migrate, extract or partition into contacting materials over time.
The same mobility that enables plasticization also contributes to exposure and environmental-release concerns.
Current harmonized European classification identifies BBP Butyl Benzyl Phthalate as Reproductive Toxicity Category 1B and very toxic to aquatic life with long-lasting effects.
Current European regulatory frameworks also identify endocrine-disrupting properties relevant to human health.
BBP Butyl Benzyl Phthalate is included on the European Authorisation List and is heavily restricted in many plasticized articles.

RoHS also restricts BBP Butyl Benzyl Phthalate to 0.1% in homogeneous materials of covered electrical and electronic equipment, subject to scope and exemptions.
Modern U.S. rules prohibit children's toys and childcare articles containing more than 0.1% BBP Butyl Benzyl Phthalate in covered accessible components.
A final U.S. risk evaluation released in December 2025 concluded that BBP Butyl Benzyl Phthalate presents unreasonable risk to human health for two evaluated worker conditions of use and unreasonable risk to the environment for seven evaluated conditions of use.
For these reasons, many historical BBP Butyl Benzyl Phthalate applications should be understood as legacy technical uses rather than default modern recommendations.
Current product development should perform regulatory screening before formulation, sampling or commercial supply.
Where BBP Butyl Benzyl Phthalate remains legally permitted, formulation work should evaluate plasticizer efficiency, polymer compatibility, migration, extraction, volatility, hardness, low-temperature flexibility and long-term service behavior.

Ataman Chemicals can provide technical and commercial support for BBP Butyl Benzyl Phthalate together with current product-specific TDS, SDS and COA documentation.

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