Overview
EVA filler grade plastic is a specialized form of ethylene-vinyl acetate copolymer designed to accommodate high loadings of mineral fillers (typically 20-60% by weight). The material combines the inherent flexibility and processability of EVA with the cost-saving and performance-enhancing benefits of filler incorporation. This grade is distinct from standard EVA by its optimized molecular structure that improves compatibility with inorganic fillers like calcium carbonate or talc. Manufacturers value it for achieving desired physical properties while reducing raw material costs in applications where pure polymer performance isn't required.
Physical and Chemical Properties
The physical properties of EVA filler grade vary significantly based on vinyl acetate (VA) content and filler percentage. Higher VA content (18-40%) increases flexibility and transparency but reduces heat resistance. Typical hardness ranges from 60 to 90 Shore A, with tensile strength between 5-15 MPa. Chemically, the material maintains EVA's resistance to UV radiation and ozone, though excessive filler loading may compromise these properties. Its excellent weatherability makes it suitable for outdoor applications. The filled compounds exhibit reduced cold flow compared to unfilled EVA, improving dimensional stability in finished products.
Main Applications
The footwear industry consumes approximately 40% of EVA filler grade production, primarily for midsole components where its lightweight cushioning and cost efficiency are critical. In wire and cable applications, it serves as an insulation material that balances flexibility and flame retardancy when compounded appropriately. Automotive manufacturers utilize filled EVA for vibration-damping mats and interior trim components. The construction sector applies it in expansion joint fillers and waterproofing membranes. Recent developments include solar panel encapsulation films, where its UV stability and electrical insulation properties prove valuable.
Safety and Storage
EVA filler grade plastics pose minimal health risks under normal handling conditions, though dust generation during processing requires standard particulate controls. The material is classified as non-hazardous for transportation under most international regulations. Proper storage involves maintaining temperatures below 35°C in moisture-controlled environments to prevent caking of filled compounds. Bulk bags should be stacked no more than 5 high to avoid compaction. Shelf life typically exceeds 12 months when stored correctly, though filler separation may occur in extended storage - mixing before use is recommended.
B2B Procurement Guide
Industrial buyers should specify three critical parameters: VA content (typically 18%, 28%, or 40%), filler type and percentage (commonly 30-50% CaCO3), and melt flow index (2-30 g/10min). Reputable Asian manufacturers dominate global supply, with production concentrated in China, South Korea, and Taiwan. Quality verification should include testing for filler dispersion uniformity and thermal stability. For large orders (20+ metric tons), negotiate quarterly pricing agreements to mitigate market fluctuations. Consider regional production facilities to reduce logistics costs - many global suppliers offer local compounding services to customize formulations.
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