DIOCTYL ADIPATE

Dioctyl adipate is an adipic acid ester used to modify compatible plastics, with the linear product covered here identified by CAS 123-79-5, formula C22H42O4 and the name di-n-octyl adipate. Formulators evaluate this material when they need to adjust flexibility and processing while balancing migration and aging performance. The molecules act between polymer chains through external plasticization, so the final result depends on the resin, loading and complete additive package.

CAS No: 123-79-5
EC No: 204-652-9
Molecular formula: C22H42O4
Molecular weight: approximately 370.57 g/mol
Physical form: oily liquid in representative product descriptions
Appearance: clear and colorless in the evaluated specification
Water compatibility: practically insoluble
Ethanol compatibility: soluble
Specific gravity: approximately 0.924-0.930 at 20°C in a documented specification
Odor profile: slightly fatty in the evaluated flavoring record

WHAT IS DIOCTYL ADIPATE?

Dioctyl adipate is a low-molecular-weight ester plasticizer, and CAS 123-79-5 specifically identifies its linear n-octyl form. In a suitable polymer, this adipate changes the balance between rigidity and flexibility without becoming part of the polymer's covalent backbone.

The name on a quotation deserves close attention. DOA is also used for bis(2-ethylhexyl) adipate, CAS 103-23-1, whose octyl groups are branched. The present article concerns the linear ester, rather than treating the commercial name as one universal substance.

Its production chemistry starts from adipic acid and n-octanol. Esterification joins the alcohol-derived groups to the diacid, and finishing controls unreacted material and other quality parameters. Using 2-ethylhexanol changes the ester identity even though the elemental formula remains the same.

Commercial supply covers different purposes. A technical plasticizer is selected for compounding, whereas an analytical reference material supports chemical measurement. A specialist sensory grade needs its own specification and application documentation, and a reference solution also contains a stated solvent at a stated concentration.

COMMON PRODUCT & CHEMICAL NAMES OF DIOCTYL ADIPATE:

Dioctyl adipate, di-n-octyl adipate, dioctyl hexanedioate, adipic acid bis-n-octyl ester, adipic acid dioctyl ester, hexanedioic acid dioctyl ester.

These names refer to the linear structure only when the accompanying identity is CAS 123-79-5. The short form DOA should therefore travel with a CAS number in technical correspondence. DEHA belongs to the branched adipate identity and is not used here as an interchangeable synonym.

CHEMICAL IDENTITY AND GRADE SELECTION FOR DIOCTYL ADIPATE

Substance: dioctyl hexanedioate
CAS identification: 123-79-5
EC / EINECS identification: 204-652-9
Ester type: adipic acid ester with two linear C8 groups
Formula and molar mass: C22H42O4, approximately 370.57 g/mol
Specialist flavoring records: FEMA 4476 and JECFA 1968

Two separate checks are needed at purchase. First establish the molecular identity, then establish whether the offered grade meets the intended use. A correct formula does not resolve the isomer question, while a correct CAS number alone does not certify the purity or suitability of a batch.

Flavoring identifiers are distinct from E numbers and from a food-contact declaration. A similarly named cosmetic ingredient does not justify assigning an INCI name to an unspecified industrial material. Missing grade or application details should be clarified with Ataman Kimya.

MOLECULAR DESIGN OF DIOCTYL ADIPATE

An adipate segment sits between two straight octyl chains. Written in condensed form, the structure is CH3(CH2)7-O-C(=O)-(CH2)4-C(=O)-O-(CH2)7CH3. It contains two ester functions and no aromatic phthalate ring.

This combination gives a molecule with polar ester sites and substantial hydrocarbon character. The distinction helps explain why the material can interact with compatible organic formulations while remaining practically insoluble in water. Structural branching must still be considered, because matching carbon count does not guarantee matching packing or physical behavior.

PLASTICIZATION AND RETENTION OF DIOCTYL ADIPATE

The useful effect comes from changing how polymer chains interact and move. Once distributed through a compatible resin, an external plasticizer can increase segmental mobility. Whether the resulting article has the required softness depends on the particular resin and the quantity incorporated.

Three questions should guide development:

Incorporation: does the ester distribute uniformly through the selected compound?
Mechanical response: is the flexibility increase acceptable alongside strength and hardness?
Retention: does performance survive extraction, migration and aging tests?

Retention is especially important because external plasticization does not chemically lock the liquid into the polymer. A clear mixture at the start of a trial can still develop surface exudation later. Insolubility in water is also insufficient to predict behavior toward oils or organic extraction media.

DIOCTYL ADIPATE TECHNICAL DATA AND THEIR INTERPRETATION

For the linear CAS identity, a documented flavoring specification gives an assay minimum of 98% and an acid-value maximum of 1 mg KOH/g. It also reports a refractive-index interval of 1.444-1.450 and specific gravity of 0.924-0.930 at 20°C. These are values within that specification framework, not automatic sales limits for a technical product.

Another specialist supply has an assay claim of at least 97%. Comparing those figures requires the relevant methods and acceptance criteria, rather than assuming that one number is the purity of all Dioctyl adipate. Residual acid, water, alcohol, color and odor requirements should be defined for the actual grade.

The acid value is obtained from titratable acidity. It should not be relabeled as pH, particularly for this practically water-insoluble ester. Likewise, a relative-density interval must retain its measurement temperature when used for incoming inspection.

Some publicly available DOA records combine isomer names or provide temperatures without enough test context. To avoid transferring data between different structures, this article does not prescribe a universal freezing point, flash point, boiling point or viscosity. Request the relevant grade-specific information from Ataman Kimya where it is needed for equipment or process design.

Low-temperature qualification belongs to both the raw material and the finished article. Testing the supplied linear ester is more reliable than assuming it shares the cold behavior of the branched adipate marketed under the same abbreviation.

DIOCTYL ADIPATE IN RESIN AND COMPOUND DEVELOPMENT

PVC is a principal plasticizer application described for this ester. Compatible rubber and cellulose-resin systems are also reported, but each requires its own evaluation. The selection should begin with the resin and processing route, followed by the target mechanical and aging requirements.

For flexible PVC compounds, the adipate can be assessed as the whole plasticizer fraction or as a part of a mixed package. The comparison must keep total loading visible. A lower hardness obtained simply by increasing the amount of plasticizer does not by itself demonstrate a more efficient material.

Flexible coatings require consideration of the whole binder system. Compatibility, surface condition and property retention need to be evaluated on the actual coating, rather than assigned from a general description of the raw ester. Dry-blend results should not be presented as proof of plastisol storage or gelation behavior.

SPECIALIST USES OF DIOCTYL ADIPATE

Analytical work uses a different set of purchasing criteria from polymer production. A laboratory may require a neat reference substance or a defined solution, with assay, concentration, solvent and uncertainty stated as applicable. Such material is supplied for measurement and does not automatically carry permission for a commercial formulation.

The linear CAS identity is also documented in the flavoring records FEMA 4476 and JECFA 1968. A slight fatty aroma is described in the evaluated specification, and specialist suppliers give additional sensory descriptions for their own grades. Industrial material should not be assigned the same sensory quality without confirmation.

JECFA's 2010 assessment addressed the flavoring intake levels evaluated at that time. It is not an unrestricted concentration recommendation for modern formulations. Direct flavoring, food-contact packaging, fragrance use and skin-contact use require separate consideration of the exact grade, exposure and destination rules.

Food packaging or medical suitability cannot be borrowed from documents for the branched ester. Obtain the documents covering the actual proposed use instead of relying on the shared DOA name.

PRACTICAL OBJECTIVES WHEN SELECTING DIOCTYL ADIPATE

Flexibility: screen whether the resin reaches the required balance of softness, tensile strength and elongation.

Processing: evaluate incorporation and compound homogeneity under the intended manufacturing route.

Package adjustment: compare the linear ester with a selected co-plasticizer while recording the total plasticizer fraction.

Consistency: connect incoming material identity and batch quality to repeatable formulation results.

These are development objectives, not guaranteed improvements. Migration, extraction or aging may limit a composition even when its initial flexibility is acceptable.

DESIGNING A FIRST DIOCTYL ADIPATE TRIAL

Begin with verified CAS 123-79-5 material and a clearly identified resin. Record the grade and assay, then define what will be held constant and what will change between trials. Comparing unrecorded stabilizer or lubricant changes can obscure the contribution of the plasticizer.

The two proposed screening compositions below use weight percentages of the complete initial compound. They are newly selected development examples, not validated commercial recipes, and they do not predict approval or finished-product performance. Actual stabilizer and lubricant levels must be adjusted to the selected commercial products.

TRIAL A: DIOCTYL ADIPATE AS THE ONLY PLASTICIZER

Components:

Dioctyl adipate, CAS 123-79-5: 27.00%
PVC resin selected for the intended compounding route: 70.00%
Calcium/zinc PVC stabilizer package: 2.00%
Compatible processing lubricant: 1.00%
Total: 100.00%

At this composition the adipate loading is approximately 38.57 phr, meaning 38.57 parts by mass per 100 parts PVC. The 27% figure describes the whole compound, so it must not be reported as 27 phr.

Record incorporation behavior first, then measure hardness, tensile response and elongation. Follow those initial measurements with cold-flexibility, surface-exudation, extraction and aging evaluations. A favorable first observation is insufficient for equipment or end-use release.

TRIAL B: DIOCTYL ADIPATE IN AN EQUAL-MASS PLASTICIZER BLEND

Components:

Dioctyl adipate, CAS 123-79-5: 13.50%
Bis(2-ethylhexyl) terephthalate, DOTP: 13.50%
The same PVC resin: 70.00%
The same calcium/zinc stabilizer package: 2.00%
The same processing lubricant: 1.00%
Total: 100.00%

Total plasticizer remains 27% of the compound, or approximately 38.57 phr. Each ester contributes approximately 19.29 phr, subject to rounding. This design changes the plasticizer composition while retaining the same resin fraction and provisional additive levels.

Compare the two trials at matched processing conditions, and include a DOTP-only control where appropriate. Check phase uniformity, mechanical properties and retention after aging, rather than predicting the blend by averaging the component descriptions. Neither trial establishes food-contact, cosmetic, toy, cable or medical compliance.

ALTERNATIVE SELECTION FOR DIOCTYL ADIPATE

The first comparison is with the branched adipate, CAS 103-23-1. It is a structural isomer with the same formula and approximately the same molar mass, not another name for CAS 123-79-5. Its measured properties must be considered separately.

DOTP offers a terephthalate structure and can be examined as a co-plasticizer or control in a suitable PVC study. Longer-chain adipates, including diisodecyl and diisotridecyl adipates, provide further structural alternatives. None should be substituted by equal mass without considering the complete compound.

Define the comparison around the actual requirement: flexibility, processing, permanence or a combination of these. Keep the resin, test conditions and acceptance limits clear enough to explain why one package is selected over another.

INCOMING QUALITY AND PURCHASING OF DIOCTYL ADIPATE

Identity should be settled before commercial comparison. The order description should state Dioctyl adipate, CAS 123-79-5, linear n-octyl ester, together with whether neat liquid or a solution is required.

Build the acceptance requirements around:

Identity and analytical assay
Residual acid, moisture and unreacted alcohol
Color and odor relevant to the application
Physical-property methods and temperatures
Impurity requirements for the selected use
Batch traceability and packaging integrity

A batch COA, a technical specification and a current SDS answer different questions. Review all relevant documents, including any supplier restrictions on research or commercial use. For specialist food, fragrance or cosmetic work, obtain the corresponding application evidence rather than interpreting a catalog grade as general approval.

Price comparisons should account for quantity, grade, certification and packaging. Analytical standards and industrial material have different supply costs and purposes. Ask Ataman Kimya to clarify missing limits or offered-grade details before finalizing the specification.

STORAGE AND TRANSFER OF DIOCTYL ADIPATE

Use closed, identified containers and clean transfer equipment. Protect the liquid from contamination and excessive heating, and keep it apart from strong oxidizing materials. Storage temperature and shelf life should be agreed for the offered grade with Ataman Kimya.

Spill containment should account for an oily liquid that can spread and make floors slippery. Collect with a suitable absorbent, keep residues out of drains and arrange appropriate disposal of both waste and contaminated packaging.

Transport classification is another product-specific field. The reviewed supplier product is reported as not regulated as dangerous goods under the stated US road, sea and air provisions. Confirm the actual shipment classification instead of copying a UN number from a differently identified adipate.

DIOCTYL ADIPATE SAFETY AND EXPOSURE CONTROL

The reviewed 2026 US supplier SDS assigns H315 and H319 to its grade, corresponding to skin and eye irritation. Classification differs among available supplier records, so the exact supplied product and destination framework govern the label. An unrestricted claim of nontoxicity is not justified.

Control contact using suitable gloves, eye protection and ventilation for the operation. Remove contaminated clothing after skin exposure and wash thoroughly. Rinse exposed eyes carefully with water and obtain medical attention, and seek advice for significant exposure or continuing symptoms.

The ester is combustible, and fire can produce carbon oxides. Avoid uncontrolled heating and contact with strong oxidizers. Environmental release should be prevented independently of whether a product is described as non-phthalate or offered for a specialist sensory use.

DIOCTYL ADIPATE SUPPLY THROUGH ATAMAN KIMYA

For a supply inquiry, specify the linear CAS identity, required grade and intended application. ATAMAN KİMYA can then be contacted to confirm availability, packaging and the documentation relevant to the proposed use.

Include the required assay and impurity limits, trial and commercial quantities, delivery destination and timing. Clear identification at quotation stage helps prevent confusion between products sold under the DOA abbreviation.

DIOCTYL ADIPATE QUESTIONS FROM FORMULATORS AND BUYERS

Which product does this page describe?
The linear n-octyl adipate with CAS 123-79-5 and EC 204-652-9.

Can a formula check alone establish the identity?
No, the linear and branched octyl adipates share C22H42O4 and approximately 370.57 g/mol.

What should accompany the name DOA on an order?
The CAS number and a description confirming whether the octyl chains are linear or branched.

What is the alcohol component of this linear ester?
It is n-octanol.

Does a plasticizer chemically become part of PVC?
This external plasticizer is not covalently attached to the polymer backbone.

Why measure properties after aging?
Initial softness does not establish retention after migration, extraction or prolonged exposure.

Does poor water solubility guarantee extraction resistance?
No, other media and the complete polymer composition affect extraction.

What is the difference between percent and phr?
Weight percent relates to the entire compound, while phr relates to 100 parts by mass of resin.

Can DOA and DOTP be evaluated together?
Yes, a compatible mixed package can be screened with appropriate controls and testing.

Is the softest trial necessarily the best one?
No, strength, processability, migration and aging must also meet the application requirements.

Can a plastisol claim be taken from dry-blend trials?
No, the processing systems require separate evaluation.

Is one assay specification valid for every grade?
No, the offered grade and analytical method determine its acceptance limits.

What does an acid value describe?
Titratable acidity, rather than the pH of the neat ester.

Can a laboratory reference solution replace neat plasticizer?
No, its solvent and concentration change the supplied material and intended purpose.

Do flavoring identifiers authorize every industrial batch?
No, FEMA 4476 and JECFA 1968 are records for a defined identity, not blanket batch approvals.

What is needed for food-contact or skin-contact use?
Documents covering the exact grade, proposed application and applicable destination requirements.

Does non-phthalate mean no handling precautions?
No, the reviewed supplier grade carries skin and eye irritation hazards.

How should the offered material be confirmed?
Match the identity, specification, batch COA and current SDS, then resolve any discrepancies with Ataman Kimya.

DIOCTYL ADIPATE - TECHNICAL SUMMARY

Under CAS 123-79-5, Dioctyl adipate denotes the linear diester formed from adipic acid and n-octanol. The associated EC number is 204-652-9, the formula is C22H42O4 and the molar mass is approximately 370.57 g/mol.

Its function in a compatible plastic is external plasticization. Selection therefore combines an assessment of flexibility and processing with verification of migration, extraction and aging behavior.

The commercial abbreviation DOA also covers a branched adipate identity in the market. Confirming the structure prevents technical data and application claims from being transferred between distinct substances.

Grade differences are as important as identity. Technical compound ingredients, analytical standards and specialist sensory supplies require different acceptance criteria and documentation.

Safe handling, transport and any regulated application must be assessed for the actual product. A successful bench formulation or a flavoring record does not establish every finished-product approval.

Dioctyl adipate can be sourced from ATAMAN KİMYA. For further information and supply inquiries about Dioctyl adipate, please contact ATAMAN KİMYA.