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Ethylene vinyl acetate 18% (EVA 18%)

Ethylene-vinyl acetate (EVA), also known as poly (ethylene-vinyl acetate) (PEVA), is the copolymer of ethylene and vinyl acetate. Ethylene vinyl acetate foam is widely used as padding for wakeboard boots, waterski boots etc. It is extensively used as a shock absorber in sports shoes, and currently, Ethylene vinyl acetate slippers and sandals are very popular because of their key features and properties. The weight percent vinyl acetate usually varies from 10 to 40%, with the remainder being ethylene. Broadly speaking, there are three different types of EVA copolymer, which differ in the vinyl acetate (VA) content and the way the materials are used:

  1. The EVA copolymer which is based on a low proportion of VA (approximately up to 4%) may be referred to as vinyl acetate modified polyethylene. It is a copolymer and is processed as a thermoplastic material – just like low density polyethylene. It has some of the properties of low density polyethylene but increased gloss (useful for film), softness and flexibility. The material is generally considered non-toxic.
  2. The EVA copolymer which is based on a medium proportion of VA (approximately 4 to 30%) is referred to as thermoplastic ethylene-vinyl acetate copolymer and is a thermoplastic elastomer material. It is not vulcanized but has some of the properties of rubber or of plasticized polyvinyl chloride particularly at the higher end of the range. Both filled and unfilled EVA materials have good low temperature properties and are tough. The materials with approximately 11% VA are used as hot melt adhesives.
  3. The EVA copolymer which is based on a high proportion of VA (greater than 60%) is referred to as ethylene-vinyl acetate rubber.

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Description

Applications and features:

Ethylene-vinyl acetate (EVA) copolymers are used in extrusion film processes for applications including packaging, surface protection, and greenhouse covers, and in photovoltaic cell encapsulation. EVA copolymers are used in molded caps and seals, footwear, and car interiors. They are the base polymer in many adhesive resin formulations and in wire and electrical cables compounding. For the hot-melt adhesive needed to hold pages and covers together in bookbinding applications, low to medium MI and high VA grades are used to maximize cohesive strength and flexibility. EVA is an elastomeric polymer that produces materials that are “rubber-like” in softness and flexibility. The material has good clarity and gloss, low-temperature toughness, stress crack resistance, hot-melt adhesive waterproof properties, and resistance to UV radiation. EVA has a distinctive vinegar-like odor and is competitive with rubber and vinyl polymer products in many electrical applications.


Technical Specifications

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