Quick Search
Di-n-octyl adipate is a high-boiling aliphatic ester primarily employed as a specialty plasticizer in flexible polymer, coating, adhesive, and elastomer formulations.
Di-n-octyl adipate provides excellent low-temperature flexibility while contributing to softness, elasticity, light stability, and efficient processing.
Di-n-octyl adipate is the linear dioctyl ester of adipic acid and should be distinguished from branched di(2-ethylhexyl) adipate, which is also frequently marketed under the abbreviation DOA.
CAS Number: 123-79-5
EC Number: 204-652-9
Molecular Formula: C₂₂H₄₂O₄
Molecular Weight: 370.57 g/mol
SYNONYMS:
Di-n-octyl Adipate, Dioctyl Adipate, DOA, Dioctyl Hexanedioate, Di-n-octyl Hexanedioate, Adipic Acid Dioctyl Ester, Adipic Acid Di-n-octyl Ester, Adipic Acid Bis(n-octyl) Ester, Adipic Acid Dioctylester, Adipic Acid Di-n-octylester, Hexanedioic Acid Dioctyl Ester, Hexanedioic Acid Di-n-octyl Ester, Hexanedioic Acid 1,6-Dioctyl Ester, Hexanedioic Acid Bis(n-octyl) Ester, Dioctyl Ester of Hexanedioic Acid, Dioctyl Ester of Adipic Acid, Di-n-octyl Ester of Adipic Acid, Bis(n-octyl) Adipate, Bis(n-octyl) Hexanedioate, Dioctyl 1,6-Hexanedioate, Di-n-octyl 1,6-Hexanedioate, Octyl Adipate, Dicaprylyl Adipate, Dicapryl Adipate, Adipic Acid Dicapryl Ester, Adipic Acid Di-n-capryl Ester, Di-normal-octyl Adipate, Adipic Acid Di-normal-octyl Ester, Linear Dioctyl Adipate, Linear C8 Adipate, Di-C8 Adipate, Adipic Acid Di-C8 Ester, n-Octyl Adipate, Octyl Hexanedioate, Dioctyl Hexanedioic Acid Ester, Hexanedioic Acid Dioctylester, Dioctyl Adipate Ester, Dioctyl Adipate Plasticizer, Di-n-octyl Adipate Plasticizer, Adimoll DO, Adiimoll DO, NSC 16201, NSC-16201, FEMA 4476, UNII-2BD76YG9SI, 2BD76YG9SI, EINECS 204-652-9, EC 204-652-9, CAS 123-79-5
APPLICATIONS
Di-n-octyl adipate serves as a cold-resistant plasticizer in flexible polyvinyl chloride formulations requiring softness and elasticity at reduced temperatures.
Di-n-octyl adipate enhances the flexibility of PVC films by reducing their tendency to stiffen or crack during cold-weather service.
Di-n-octyl adipate supports the manufacture of plasticized PVC sheets intended for outdoor, refrigerated, and temperature-sensitive applications.
Di-n-octyl adipate provides a soft and flexible character to calendered vinyl products without unnecessarily increasing compound rigidity.
Di-n-octyl adipate functions as a performance plasticizer in wire and cable insulation compounds exposed to low ambient temperatures.
Di-n-octyl adipate contributes to flexible cable sheathing by helping the polymer withstand bending, coiling, and repeated mechanical movement.
Di-n-octyl adipate facilitates the production of soft electrical coverings that must preserve flexibility during installation and operation.
Di-n-octyl adipate enables cable compounds to combine cold resistance with useful dielectric and processing characteristics.
Di-n-octyl adipate finds application in flexible PVC hoses intended for air transfer, light-duty fluid handling, and general industrial service.
Di-n-octyl adipate promotes pliability in tubing that may be bent, rolled, or stored under subambient conditions.
Di-n-octyl adipate offers improved low-temperature performance in outdoor water hoses and flexible protective conduits.
Di-n-octyl adipate helps polymer tubing retain a smooth surface and manageable flexibility throughout fabrication and use.
Di-n-octyl adipate is incorporated into agricultural films that require resistance to embrittlement during cool seasonal conditions.
Di-n-octyl adipate improves the flexibility of greenhouse coverings, protective sheets, and other thin polymer films exposed to outdoor temperatures.
Di-n-octyl adipate supports cold-resistant film formulations by complementing general-purpose plasticizers and extending their performance range.
Di-n-octyl adipate provides useful softness in agricultural sheeting while allowing the material to be folded, rolled, and installed more easily.
Di-n-octyl adipate acts as a specialty plasticizer in packaging films designed for refrigerated or frozen products.
Di-n-octyl adipate allows flexible packaging materials to remain pliable when conventional compounds may become excessively rigid.
Di-n-octyl adipate contributes to improved folding and handling characteristics in polymer films used under controlled low-temperature conditions.
Di-n-octyl adipate reduces the risk of brittle behavior in packaging structures when compatibility and regulatory requirements have been properly evaluated.
Di-n-octyl adipate functions as a co-plasticizer in formulations containing other monomeric or polymeric plasticizers.
Di-n-octyl adipate enables formulators to improve low-temperature flexibility without relying on a single plasticizer for every performance requirement.
Di-n-octyl adipate complements higher-permanence plasticizers by supplying additional softness and cold resistance.
Di-n-octyl adipate offers flexibility in blended plasticizer systems used to balance processing, volatility, migration, and mechanical properties.
Di-n-octyl adipate finds application in synthetic leather formulations where softness, drape, and a pleasant surface feel are required.
Di-n-octyl adipate enhances the flexibility of coated leather substitutes used in garments, upholstery, footwear, and consumer goods.
Di-n-octyl adipate supports smooth calendering and coating processes while helping the finished material resist cold cracking.
Di-n-octyl adipate provides a softer hand to compatible vinyl layers without compromising their ability to undergo repeated folding.
Di-n-octyl adipate serves as a plasticizing component in coated fabrics used for flexible covers, protective materials, and industrial textiles.
Di-n-octyl adipate contributes to the drape and bendability of polymer-coated textile structures.
Di-n-octyl adipate facilitates spreading and coating operations by modifying the flow behavior of compatible resin systems.
Di-n-octyl adipate enables coated fabrics to retain flexibility when exposed to variations in service temperature.
Di-n-octyl adipate functions as a viscosity-modifying plasticizer in selected PVC plastisol formulations.
Di-n-octyl adipate promotes a relatively low initial paste viscosity, thereby supporting pumping, mixing, coating, and dispensing operations.
Di-n-octyl adipate helps maintain workable flow properties during the storage and processing of properly stabilized plastisols.
Di-n-octyl adipate allows formulators to adjust gelation, spreading behavior, film flexibility, and final product softness.
Di-n-octyl adipate finds application in dip-coating formulations for flexible grips, protective coverings, coated components, and related articles.
Di-n-octyl adipate supports the formation of soft polymer layers around metal, fabric, or molded substrates.
Di-n-octyl adipate enhances the ability of compatible coatings to tolerate bending and mechanical deformation after curing or fusion.
Di-n-octyl adipate provides useful processing flexibility in coating systems applied by dipping, spreading, calendering, or related techniques.
Di-n-octyl adipate serves as a plasticizer in selected synthetic rubber compounds requiring improved elasticity at low temperatures.
Di-n-octyl adipate enhances the cold flexibility of compatible nitrile rubber formulations used in seals, sleeves, diaphragms, and technical components.
Di-n-octyl adipate supports elastomer compounds based on styrene-butadiene rubber when additional softness and processability are required.
Di-n-octyl adipate contributes to chloroprene and other specialty elastomer formulations after compatibility, extraction resistance, and service conditions have been evaluated.
Di-n-octyl adipate provides flexibility in rubber seals and gaskets intended to undergo compression, movement, or vibration.
Di-n-octyl adipate enables flexible boots, bellows, sleeves, and molded mechanical goods to retain elasticity in cool operating environments.
Di-n-octyl adipate helps reduce compound hardness while supporting the dispersion of fillers and other formulation ingredients.
Di-n-octyl adipate offers processing advantages in compatible rubber compounds by lowering viscosity and facilitating mixing or molding.
Di-n-octyl adipate functions as a plasticizer for selected vinyl chloride copolymers, polystyrene systems, nitrocellulose, and ethyl cellulose formulations.
Di-n-octyl adipate contributes to flexible lacquers and surface coatings in which film softness and resistance to cracking are important.
Di-n-octyl adipate facilitates pigment dispersion and film formation in compatible paint, varnish, and printing-ink systems.
Di-n-octyl adipate supports adhesive and sealant formulations by improving application behavior and allowing the finished polymer layer to accommodate movement.
Di-n-octyl adipate serves as a process modifier in extrusion, calendering, coating, and molding operations involving compatible flexible polymers.
Di-n-octyl adipate enhances resin wetting and additive distribution, thereby supporting more uniform compound preparation.
Di-n-octyl adipate contributes to reduced processing stiffness and may permit smoother fabrication at appropriately selected temperatures.
Di-n-octyl adipate offers manufacturers a versatile route for adjusting softness, low-temperature elasticity, viscosity, and handling characteristics across specialized polymer formulations.
DESCRIPTION
Di-n-octyl adipate is generally supplied as a clear, colorless to pale-yellow oily liquid with a mild ester-like odor.
Chemically, Di-n-octyl adipate is a diester formed from adipic acid and two molecules of linear n-octanol.
Structurally, its molecule contains a central adipate group connected to two flexible straight-chain C8 alkyl groups.
This linear molecular arrangement differentiates Di-n-octyl adipate from branched adipates produced from 2-ethylhexanol.
Commercial and technical literature sometimes uses the abbreviation DOA for both Di-n-octyl adipate and di(2-ethylhexyl) adipate.
For this reason, the CAS number and structural identity should always be confirmed when selecting specifications, safety documents, or regulatory information.
Di-n-octyl adipate is specifically associated with CAS Number 123-79-5, whereas di(2-ethylhexyl) adipate is a separate substance.
Its systematic chemical name is dioctyl hexanedioate, reflecting the esterification of hexanedioic acid with two n-octyl groups.
Di-n-octyl adipate is commonly produced through the catalytic esterification of adipic acid with excess n-octanol.
During production, the water generated by esterification is continuously removed to drive the reaction toward completion.
The crude ester may subsequently undergo neutralization, washing, vacuum stripping, filtration, and purification.
Careful processing helps manufacturers obtain a product with low acidity, low moisture, light color, and high ester content.
As a plasticizer, Di-n-octyl adipate penetrates compatible polymer matrices and increases molecular mobility between adjacent polymer chains.
This effect reduces intermolecular attraction, lowers stiffness, and improves the ability of the material to deform without fracturing.
Its flexible aliphatic structure is particularly useful where low-temperature elasticity and soft tactile properties are desired.
Di-n-octyl adipate may be employed alone in selected formulations, although it is frequently blended with other plasticizers to balance permanence and performance.
Di-n-octyl adipate has very limited solubility in water because of its long hydrophobic alkyl chains.
In contrast, it dissolves in or mixes with many common organic solvents, ester plasticizers, oils, and compatible resin systems.
Compatibility depends on the polymer type, plasticizer concentration, processing conditions, and the presence of fillers or other additives.
Laboratory trials are therefore recommended before Di-n-octyl adipate is introduced into a new commercial formulation.
Its relatively low viscosity permits convenient pumping, metering, mixing, and dispersion during industrial processing.
Its high boiling character and low vapor pressure limit rapid evaporation under normal handling conditions.
Under recommended storage conditions, Di-n-octyl adipate remains chemically stable and does not undergo hazardous polymerization.
Exposure to excessive heat, strong oxidizing agents, strong acids, or strong alkalis should nevertheless be avoided.
Quality control commonly includes measurements of ester content, acid value, moisture, color, density, refractive index, and flash point.
Variations in raw materials, purification methods, stabilizer packages, and production grades can result in different commercial specifications.
Its performance should be assessed in relation to volatility, migration, extraction resistance, low-temperature behavior, and polymer compatibility.
Current supplier documentation and the applicable Safety Data Sheet should always be consulted before industrial use.
PROPERTIES
Chemical Name: Di-n-octyl adipate
Chemical Class: Aliphatic dicarboxylic acid ester
CAS Number: 123-79-5
EC Number: 204-652-9
Molecular Formula: C₂₂H₄₂O₄
Molecular Weight: 370.57 g/mol
IUPAC Name: Dioctyl hexanedioate
Appearance: Clear, colorless to pale-yellow oily liquid
Odor: Mild ester-like or slightly fatty odor
Physical State: Liquid
Typical Ester Content: ≥99.0%
Typical Density at 20°C: Approximately 0.924–0.929 g/cm³
Typical Refractive Index: Approximately 1.446–1.449
Freezing Point: Approximately −68°C
Boiling Characteristics: High-boiling ester; reported values depend strongly on measurement pressure
Typical Flash Point: Approximately 190°C or higher
Water Solubility: Practically insoluble or only very slightly soluble
Solubility in Organic Media: Soluble in many common organic solvents and compatible plasticizers
Vapor Pressure: Very low at room temperature
Typical Acid Value: ≤0.10 mg KOH/g
Typical Moisture Content: ≤0.10%
Typical Color: ≤30 APHA, depending on commercial grade
Volatility: Low under normal processing and storage conditions
pH: Not applicable to the anhydrous ester
Chemical Stability: Stable under recommended storage conditions
Incompatible Materials: Strong oxidizing agents, strong acids, and strong alkalis
Hazardous Decomposition Products: Carbon monoxide, carbon dioxide, and irritating fumes may form during combustion or severe thermal decomposition
FIRST AID
Inhalation: Move the affected person to fresh air and keep them at rest in a position comfortable for breathing. Obtain medical attention if coughing, dizziness, breathing difficulty, or other symptoms develop or persist.
Skin Contact: Remove contaminated clothing and wash the affected skin thoroughly with soap and water. Seek medical advice if irritation develops. Clean contaminated clothing before reuse.
Eye Contact: Rinse cautiously with clean water for several minutes, lifting the upper and lower eyelids occasionally. Remove contact lenses when present and easy to do, then continue rinsing. Obtain medical attention if discomfort or irritation persists.
Ingestion: Rinse the mouth with water. Do not induce vomiting unless directed by qualified medical personnel. Never give anything by mouth to an unconscious person. Contact a physician or poison information center if a significant quantity has been swallowed or symptoms occur.
Note to Physicians: No specific antidote is generally identified. Provide supportive care and treat according to the patient’s symptoms and clinical condition.
HANDLING AND STORAGE
Handling: Handle Di-n-octyl adipate in accordance with good industrial hygiene and chemical safety practices. Avoid unnecessary contact with the skin and eyes, prevent the formation of aerosols or mists, and wash thoroughly after handling. Keep containers closed when the product is not being transferred.
Ventilation: Provide adequate general ventilation in storage and processing areas. Use local exhaust ventilation where heating, spraying, mist formation, or enclosed processing could increase airborne exposure. Respiratory protection should be selected according to the exposure assessment and applicable regulations.
Storage: Store Di-n-octyl adipate in tightly closed, correctly labeled containers in a cool, dry, and well-ventilated location. Protect the product from excessive heat, direct sunlight, moisture, and strong oxidizing materials. Maintain storage temperatures suitable for preserving product quality and pumpability.
Spill and Leak Procedures: Stop the leak when this can be done safely and prevent the material from entering drains, soil, or surface water. Contain the spill with sand, earth, vermiculite, or another suitable inert absorbent. Collect the absorbed material in labeled containers for recovery or disposal according to local regulations. Clean the affected surface carefully because residual liquid may create a slipping hazard.
Handling Precautions: Wear suitable protective gloves, safety glasses or chemical goggles, and appropriate protective clothing. Use grounded transfer equipment where required by the process, keep ignition sources away from heated product or generated mist, and avoid mixing Di-n-octyl adipate with incompatible chemicals. Review the current supplier Safety Data Sheet before large-scale handling, transfer, storage, or disposal.
