Dioctyl Sebacate[2]
Overview
Dioctyl Sebacate (DOS) is an organic ester derived from sebacic acid and 2-ethylhexanol. It is a non-toxic, biodegradable plasticizer prized for its compatibility with polymers like PVC and its ability to enhance flexibility, especially in low-temperature environments. Its stability under heat and resistance to migration make it a preferred choice for durable industrial and consumer products. Initially developed as a specialty plasticizer, DOS has gained prominence in applications requiring prolonged material integrity, such as automotive parts, wire insulation, and medical devices. Its low volatility and resistance to extraction by oils or solvents further broaden its utility in demanding environments.
Physical and Chemical Properties
DOS is a clear, viscous liquid with a mild ester-like odor. Its low melting point (-55°C) ensures performance in subzero conditions, while its high boiling point (248°C at reduced pressure) minimizes evaporation during processing. The compound's density (0.915-0.917 g/cm³) and solubility profile make it easy to blend with polymers and resins. Key chemical attributes include hydrolysis resistance and oxidative stability, which prevent degradation during prolonged use. Its molecular structure, featuring long alkyl chains, contributes to low migration rates, reducing the risk of material embrittlement over time.
Main Applications
DOS is primarily used as a plasticizer in PVC formulations for cables, hoses, and synthetic leather, where flexibility at low temperatures is critical. It also serves as a lubricant in metalworking fluids and a component in specialty coatings for aerospace and automotive interiors. In the medical field, DOS is employed in blood bags and tubing due to its biocompatibility. Additionally, it acts as a dielectric fluid in capacitors and a softening agent for synthetic rubbers like nitrile and neoprene, enhancing their elasticity and durability.
Safety and Storage
While DOS is classified as non-hazardous, prolonged skin contact should be avoided to prevent irritation. Use nitrile gloves and goggles when handling. Ensure workspaces are well-ventilated to minimize inhalation of vapors during high-temperature processing. Store DOS in sealed containers away from direct sunlight and heat sources. Ideal storage temperatures range between 10°C and 30°C. Incompatible materials include strong oxidizers, which may cause decomposition. Spills should be contained using absorbent materials like sand or vermiculite.
B2B Procurement Guide
When sourcing DOS, prioritize suppliers with ISO 9001 certification and batch-specific COAs (Certificates of Analysis) confirming purity ≥99%. Bulk shipments (drums or totes) typically offer cost savings, with prices varying by volume and regional availability. Evaluate suppliers for traceability and compliance with regulations like REACH and RoHS. Technical support for formulation optimization is a value-added service offered by specialized distributors. For niche applications (e.g., medical-grade), request additional testing data such as USP/EP compliance reports.
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