Overview
Ethylene-octene copolymer (EOC) is a thermoplastic elastomer produced by copolymerizing ethylene and octene monomers. It bridges the gap between rigid plastics and rubber, offering a unique balance of strength and elasticity. Developed as an alternative to vulcanized rubber, EOC is favored for its recyclability and ease of processing via injection molding or extrusion. EOC grades vary by octene content, which influences flexibility and crystallinity. Higher octene levels (e.g., 20%) yield softer materials with greater stretchability, while lower levels (e.g., 5%) provide semi-rigid properties. This adaptability makes EOC a versatile choice across industries.
Physical and Chemical Properties
EOC exhibits low density (0.86–0.91 g/cm³) and a melting range of 60–120°C, depending on its octene ratio. Its amorphous structure grants exceptional impact resistance at temperatures as low as -50°C, outperforming many polyethylenes. The material is hydrophobic and resistant to acids, alkalis, and polar solvents, though it may swell in nonpolar hydrocarbons. Key mechanical properties include tensile strengths of 5–25 MPa and elongations up to 1,000%. Additives like UV stabilizers or flame retardants can be incorporated during production to enhance performance for specific environments, such as outdoor or electrical applications.
Main Applications
In the automotive sector, EOC is used for door seals, bumper covers, and under-hood components due to its vibration damping and heat resistance (up to 135°C). It replaces traditional EPDM rubber in many cases, reducing weight and manufacturing costs. The wire and cable industry leverages EOC's dielectric properties for insulation jackets, especially in low-voltage applications. Consumer goods like shoe soles, soft-touch grips, and stretchable packaging films also benefit from its durability and tactile appeal. Medical-grade EOC meets biocompatibility standards for tubing and prosthetics.
Safety and Storage
EOC is generally classified as non-hazardous under GHS standards but requires precautions during high-temperature processing. Fumes released above 200°C may irritate respiratory systems; local exhaust ventilation is recommended. Dust generation is minimal due to its pelletized form. Storage should avoid prolonged exposure to temperatures above 40°C to prevent agglomeration. Moisture absorption is negligible, but containers should remain sealed to minimize contamination. Shelf life typically exceeds two years when stored properly.
B2B Procurement Guide
When sourcing EOC, prioritize suppliers that provide technical data sheets (TDS) with verified octene content and MFI values. For extrusion applications, opt for grades with MFI 1–5 g/10min; injection molding may require higher MFI (10–30 g/10min). Bulk purchases (20+ metric tons) often qualify for discounts of 5–15%. Consider regional availability: North American and Asian producers dominate supply, with shipping costs affecting final pricing. Sample testing is advised to confirm compatibility with existing production lines, especially for color-critical applications.
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