Dioctyl Sebacate
Overview
Dioctyl Sebacate (DOS) is a diester plasticizer derived from sebacic acid and 2-ethylhexanol. It is classified as a monomeric ester plasticizer, prized for its superior performance in extreme temperatures. DOS is non-toxic, making it suitable for medical and food-contact applications. Its primary role is to enhance the flexibility and durability of polymers, particularly PVC, without compromising thermal stability. Developed as an alternative to phthalate-based plasticizers, DOS meets stringent regulatory standards, including REACH and FDA approvals. Its low volatility and resistance to extraction by oils or water further expand its utility in industrial and consumer goods.
Physical and Chemical Properties
DOS exhibits a low viscosity and high flash point (210°C), ensuring safe processing in high-temperature environments. Its molecular structure provides exceptional compatibility with polar polymers, reducing migration risks in finished products. The ester groups contribute to hydrolytic stability, even in humid conditions. Key metrics include a pour point of -65°C, making it ideal for Arctic-grade cables, and a dielectric constant of 4.0-4.5, beneficial for electrical insulation. Unlike phthalates, DOS does not embrittle polymers over time, extending product lifespans in automotive seals and gaskets.
Main Applications
In PVC formulations, DOS is extensively used in flexible films for packaging, synthetic leather, and inflatable products. Its low-temperature performance (-50°C) is critical for refrigeration seals and cold-region construction materials. The wire & cable industry relies on DOS for insulation that remains pliable in subzero conditions. Medical applications include blood bags and IV tubing, where its non-toxicity and biocompatibility are vital. Automotive uses span dashboards, door panels, and under-the-hood components requiring heat resistance up to 125°C. Niche applications include adhesives, coatings, and as a lubricant additive.
Safety and Storage
DOS is classified as non-hazardous under GHS but requires standard chemical handling precautions. Use nitrile gloves and goggles to prevent eye/skin contact. Although it has low oral toxicity (LD50 > 5,000 mg/kg), ingestion should be avoided. Spills can be contained with absorbent materials like vermiculite. Storage tanks should be constructed from stainless steel or polyethylene to prevent contamination. Bulk storage temperatures should not exceed 40°C to maintain stability. Shelf life is typically 2 years when stored in sealed containers protected from moisture.
B2B Procurement Guide
When sourcing DOS, prioritize suppliers with ISO 9001 certification and batch-specific COAs (Certificates of Analysis). Key purity indicators include acid value (<0.1 mg KOH/g) and water content (<0.1%). For EU markets, ensure full REACH registration (EC 204-908-6) and absence of SVHCs. Procurement strategies should consider bulk shipments (IBC totes or tankers) for cost efficiency. Sample testing should evaluate compatibility with target polymers via elongation and tensile strength tests. Negotiate MOQs (Minimum Order Quantities) with tiered pricing, typically starting at 1-ton quantities.
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