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EVA resin is an ethylene-vinyl acetate copolymer, and the content of vinyl acetate (VA) is generally 5% to 40%. Compared with polyethylene, EVA is widely used in foamed shoes due to the introduction of vinyl acetate monomer in the molecular chain, thereby reducing high crystallinity, improving flexibility, impact resistance, filler compatibility and heat sealing performance. Materials, functional shed films, packaging films, hot melt adhesives, wires and cables, toys and other fields. Generally speaking, the performance of EVA resin mainly depends on the content of vinyl acetate in the molecular chain.