Overview
Extrusion grade EVA is a thermoplastic copolymer of ethylene and vinyl acetate, specifically formulated for extrusion processes. The vinyl acetate (VA) content typically ranges between 18-28%, balancing flexibility with processability. This material is favored for its rubber-like elasticity without requiring vulcanization, making it cost-effective for continuous production. Its molecular structure allows for customization of properties through variations in VA content and additive packages.
Physical and Chemical Properties
Extrusion grade EVA exhibits low crystallinity due to the random incorporation of vinyl acetate monomers, resulting in superior clarity compared to polyethylene. The material maintains flexibility at temperatures as low as -70°C, with Shore A hardness ranging from 30 to 90. Key chemical properties include resistance to UV radiation and ozone when properly compounded. The polar nature of the acetate groups enhances adhesion to polar substrates, while the material remains chemically inert to most acids and alkalis at room temperature.
Main Applications
In packaging, extrusion grade EVA produces flexible foam sheets for protective padding and athletic mats. The solar industry utilizes it for photovoltaic module encapsulation due to its light transmission and durability against environmental stress. The footwear sector accounts for approximately 40% of global EVA consumption, where it's extruded into midsoles and sandal components. Other applications include hot melt adhesives, cable jacketing, and automotive trim parts requiring noise dampening properties.
Safety and Storage
While EVA is generally considered non-toxic, thermal degradation above 200°C may release acetic acid vapors. Proper ventilation is recommended during processing. The material is not classified as hazardous under OSHA standards. Storage should maintain temperatures below 35°C with relative humidity under 80%. Pellets are hygroscopic and may require drying (2-4 hours at 50-60°C) before processing if exposed to humid conditions. Shelf life typically exceeds 12 months when stored properly.
B2B Procurement Guide
Industrial buyers should specify VA content percentage, melt flow index (typically 1-30 g/10min for extrusion), and any required certifications (FDA, ROHS). Sample testing is recommended to verify processing characteristics and final product performance. Bulk shipments usually come in 25kg bags or 1-ton supersacks. Some manufacturers offer custom compounding with additives like flame retardants or anti-static agents. Lead times vary from 2-8 weeks depending on order volume and customization requirements.
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