The difference between eva, epe and sponge

03 . Nov . 2022

EPE is developable polyethylene, also known as pearl cotton. Non-cross-linked closed-cell structure, it is a high foam polyethylene product produced by extrusion of low density polyethylene (LDPE) as the main raw material, which is composed of numerous independent bubbles produced by physical foaming of low density polyethylene lipid. It overcomes the shortcomings of brittle, deformation and poor recovery of common foam. It is waterproof, shockproof, sound insulation, heat preservation, good plasticity, strong toughness, recycling, environmental protection, strong impact resistance and many other advantages, but also has good chemical resistance.

Sponge is ly made of polyisocyanate and polyol as raw materials to synthesize, the basic reaction is the reaction of polyol and polyisocyanate to produce polyurethane, commonly used sponge is called polyurethane soft foam rubber, polyurethane is the common kind of polymer material in life, widely used in the production of various “sponge” products. As well as shock absorbers, anti-friction elastic materials EVA is made of ethylene (E) and ethylene acetate (VA) copolymerization and referred to as EVA.

EVA is characterized by good softness, rubber-like elasticity, good flexibility at -50℃, good transparency and surface gloss, good chemical stability, good anti-aging and ozone resistance, and no toxicity. Good mixing with filler, good coloring and forming processing.

EVA can be injection molding, extrusion, blow molding, rolling, vacuum thermoforming, foaming, coating, heat sealing, welding and other molding processes, can be used as building materials used as waterproof, fire, sound insulation and other functions of the three differences mainly have the following points:

1 with the naked eye can be distinguished, sponge is generally slightly yellow, very elastic, relatively lighter than these three. EVA is a bit hard, usually black, and is the heaviest among the three. EPE pearl cotton is generally white, which is easy to distinguish from sponge. Sponge can be divided into its original state no matter how you press it, while EPE pearl cotton will hear patter sound when you press it hard, and the place where you press it will be concave.

2.EPE pearl cotton has wavy pattern and looks like it has a lot of foam stuck together. It’s very light.EVA is solid. What’s the partial concentration? It’s heavy.

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