Overview
Extruded EVA is a thermoplastic copolymer manufactured through an extrusion process that incorporates gas to create a closed-cell foam structure. The material combines ethylene's rigidity with vinyl acetate's elasticity, resulting in a product with customizable hardness and flexibility. Its production involves compounding, extrusion, and cross-linking stages, allowing precise control over density (commonly 30–250 kg/m³) and cell structure. First commercialized in the 1960s, extruded EVA gained prominence as a replacement for PVC and rubber in many applications due to its lighter weight, better cushioning properties, and ease of processing. Modern formulations may include additives like flame retardants or colorants to meet specific industry requirements.
Physical and Chemical Properties
The physical properties of extruded EVA vary significantly with vinyl acetate (VA) content. At 10–18% VA, it exhibits rubber-like flexibility with Shore A hardness of 60–80; at 28–40% VA, it becomes softer (Shore A 20–50). The foam structure provides exceptional energy return (60–75% rebound) and compression set resistance (<20% after 22hrs at 70°C). Chemically, EVA demonstrates good resistance to ozone, UV radiation (with stabilizers), and polar solvents. It maintains stability between -50°C to 80°C, with thermal conductivity of 0.035–0.045 W/(m·K) in foam form. The closed-cell structure grants water resistance (0.5–2% water absorption after 24hr immersion), though adhesives require special primers due to its non-polar surface.
Main Applications
Footwear accounts for approximately 45% of extruded EVA consumption, primarily for midsole components where its lightweight cushioning (density 0.15–0.25 g/cm³) enhances comfort. In packaging, 5–10mm thick EVA sheets protect delicate electronics during shipping, offering vibration damping superior to polystyrene foams. The automotive industry utilizes EVA in dashboard components, headliners, and gaskets due to its noise reduction properties (sound transmission loss of 20–30dB at 1kHz). Emerging applications include photovoltaic module encapsulation (requiring high-purity, UV-stable grades) and marine flotation devices where closed-cell buoyancy is critical. Custom formulations with anti-static or flame-retardant additives expand its use in industrial settings.
Safety and Storage
Extruded EVA is classified as non-hazardous under GHS, though dust inhalation during machining requires NIOSH-approved N95 masks. Thermal decomposition above 200°C may release acetic acid vapors, necessitating adequate ventilation in processing areas. Finished products are generally food-safe (FDA 21 CFR 177.1350 compliant grades available). Storage recommendations include maintaining temperatures below 35°C with relative humidity under 70% to prevent premature aging. Rolls should be stored vertically to avoid deformation, with a maximum stacking height of 1.5m for sheets. Shelf life typically exceeds 12 months when protected from direct sunlight, which can cause slight yellowing in unpigmented grades.
B2B Procurement Guide
Key procurement specifications include VA content (affecting flexibility), density (kg/m³), and compression strength (kPa at 25% deflection). For footwear applications, request rebound resilience test data (>65% preferred). Industrial buyers should verify compliance with relevant standards like ASTM D3575 for foam testing or EN 1364 for fire performance. Minimum order quantities (MOQs) typically start at 500kg for standard grades, with lead times of 2–4 weeks. Custom formulations (e.g., EVA-PE blends for improved stiffness) may require 8–12 week development. Price negotiation points include volume discounts (10–15% for 20+ ton orders) and payment terms (LC at sight common for international transactions). Always request material safety data sheets (MSDS) and batch test certificates.
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