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| Synonyms:DOS Dioctyl sebacate Di(2-ethylhexyl) sebacate Diisooctyl sebacate Sebacic acid bis(2-ethylhexyl) ester Bis(2-ethylhexyl) decanedioate Molecular Formula:C26H50O4 Molecular Weight: 426.67 HS Code: 2917131000 Grade:99% Industrial grade Hazard Class:General Cargo | |||||||||
122-62-3
bosschemical
122-62-3
Bis(2‑ethylhexyl) sebacate, also known as di(2‑ethylhexyl) sebacate (or diisooctyl sebacate, abbreviated as DOS), is a fatty acid ester compound produced by the esterification of sebacic acid and 2‑ethylhexanol. Its chemical formula is usually written as:
C₂₆H₅₀O₄ (CAS No.: 122‑62‑3, molecular weight approximately 426.68, EINECS No.: 204‑558‑8)
At room temperature, it is a colourless, transparent or pale yellow oily liquid with a faint characteristic odour. Its density is approximately 0.91–0.92 g/cm³, freezing point around −55 °C, boiling point approximately 255 °C (0.5 kPa), flash point about 210 °C, refractive index roughly 1.451, and viscosity at 20 °C of approximately 19–21 mPa·s. Dioctyl sebacate is insoluble in water but soluble in most organic solvents such as ethanol, diethyl ether and benzene. It is flammable.
From a molecular‑structure perspective, dioctyl sebacate is formed by the esterification of one molecule of sebacic acid with two molecules of 2‑ethylhexanol and belongs to the diester class of compounds. Its long carbon‑chain structure delivers outstanding low‑temperature performance (freezing point as low as −55 °C) and good polymer compatibility, while the ester groups provide flexibility and lubricity. This combination of cold resistance, compatibility and lubrication makes it a premium cold‑resistant plasticizer for the plastics industry and a high‑performance base stock for the lubricant industry. These structural features underpin its broad use in wires and cables, artificial leather, aerospace lubrication and other fields.
Chemically, dioctyl sebacate is stable, has low volatility, exhibits heat and light resistance, and possesses good electrical insulation properties and low toxicity. It is flammable and should therefore be kept away from heat sources. During storage it must be kept dry and sealed, and contact with strong oxidizing agents should be avoided.
Industrial‑grade dioctyl sebacate is manufactured mainly for industrial production. Compared with reagent‑grade and other grades, industrial‑grade material focuses on the following key specifications:
Ester content is a core purity indicator and directly affects plasticizing efficiency and lubricant performance.
Acid value indicates the level of free acid. It influences product stability and downstream processing quality and must be maintained at a low level.
Excessive moisture impairs plasticizing effectiveness and lubricant quality and must be tightly controlled.
The product should be colourless or pale yellow; abnormal colour generally suggests impurities or oxidation.
Density (approximately 0.91–0.92) and refractive index are routine criteria for assessing purity and quality and must comply with specifications.
Dioctyl sebacate is widely recognised as an excellent cold‑resistant plasticizer in the plastics industry. It offers high plasticizing efficiency, low volatility, good cold resistance (freezing point −55 °C), heat and light stability, and favourable electrical insulation. It is extensively used to plasticize PVC, vinyl chloride copolymers, nitrocellulose, ethyl cellulose and other polymers. Typical end‑products include cold‑resistant wire and cable insulation, artificial leather, films, hoses and outdoor fabrics.
DOS shows good compatibility with synthetic rubber. It is employed as a plasticizer for rubbers such as nitrile rubber to improve low‑temperature flexibility and softness of rubber compounds. Applications include cold‑resistant seals, hoses and other low‑temperature rubber goods.
Dioctyl sebacate can serve as a base stock for high‑temperature lubricating oils and low‑temperature greases. It features excellent low‑temperature fluidity and thermal stability and is formulated into aviation lubricants, precision instrument oils and greases designed for extreme cold environments.
DOS acts as a lubricating component in metalworking fluids to enhance lubrication and cooling during machining. It is used in cutting, stamping and other metal‑working processes.
Dioctyl sebacate may be used as a plasticizer for food‑contact packaging materials such as food packaging films. Its migration levels must satisfy the limits specified in standards for food‑contact materials. It represents one compliant and relatively safe plasticizer option for such packaging.
Dioctyl sebacate is an approved cosmetic emollient used as a skin moisturiser, hydrating base and stabiliser. It can be found in skin creams, sunscreens and hair‑care formulations.
Its application range continues to expand, covering precision‑instrument lubricants, transformer‑oil components and cold‑resistant coating materials.
Bis(2‑ethylhexyl) sebacate, also called dioctyl sebacate (DOS), is a colourless to pale yellow oily diester with a freezing point as low as −55 °C. It combines cold resistance, good polymer compatibility and lubricating properties, earning its reputation as a high‑performance cold‑resistant plasticizer for plastics. In everyday life, people encounter it indirectly through PVC articles, low‑temperature‑use products, cosmetics, lubricants, food‑contact packaging and synthetic‑rubber goods. Industrially, industrial‑grade dioctyl sebacate is widely applied as a core cold‑resistant plasticizer, a synthetic‑rubber plasticizer, a base stock for high‑temperature lubricants and low‑temperature greases, a lubricating additive in metalworking fluids, and a plasticizer for food‑contact packaging materials. It is an important ester‑type chemical bridging consumer articles with the plastics, rubber and lubricant sectors.
