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EVA Footwear Science Popularization
From: Dongguan Houjie Hefeng (Sanhe Sheng) Shoe Material Co., Ltd. Post date: 2019-06-22

   EVA sole refers to the sole made of EVA material. EVA sole has high resilience and tension resistance, high toughness, good shock resistance, cushioning performance, excellent heat preservation, cold resistance and low temperature performance, can withstand severe cold, sealed bubble, good sound insulation effect, sealed bubble structure, non-absorbent, moisture-proof, water resistance, seawater, grease, acid, alkali and other chemicals corrosion, anti-bacterial, non-toxic, tasteless, non-polluting.

EVA sole is characterized by good softness, rubber-like elasticity, good flexibility, transparency and surface gloss under 0 C, good chemical stability, good anti-aging and ozone resistance, non-toxicity. It has good mixing property with filler, good dyeing and processing property.
It has a great relationship with the content of ethylene acetate, molecular weight and melt index. When the melting index (MI) is constant and the content of vinyl acetate (VA) increases, its elasticity, softness, compatibility and transparency also increase. When the content of VA decreases, the properties are close to polyethylene, the rigidity is increased, the wear resistance and electrical insulation are improved.

The material of EVA sole is ethylene/vinyl acetate copolymer (also known as ethylene-vinyl acetate copolymer), which is made by copolymerization of ethylene (E) and vinyl acetate (VA). It is called Ethylene Vinyl Acetate in English. Abbreviated as EVA, the content ranges from 5% to 40%. Compared with polyethylene, EVA has been widely used in the fields of foamed shoes, functional greenhouse film, packaging film, hot melt adhesive, wire and cable, toys and so on, because of the introduction of vinyl acetate monomer in the molecular chain, which reduces the high crystallinity, improves flexibility, impact resistance, filler compatibility and thermal sealing performance.