EVA explained, what is it?…
Ethylene-vinyl acetate (EVA) is the copolymer of ethylene and vinyl acetate. The weight percent vinyl acetate usually varies from 10 to 40%, with the remainder being ethylene.
The higher the VA content the more rubber-like the EVA resin is. EVA is a step up from straight polyethylene. They are both in the polyolefin family.
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.
Need more clarifications?
Ask John Free Tech Support
Contact: JOHN BONFORTE, SR., TECHNICAL SUPPORT & GM at
email: [email protected]
The EVA copolymer
Low proportion of VA
The EVA copolymer, which has 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 thermoplastics material – just like low density polyethylene. It has some of the properties of a low-density polyethylene. Generally considered as a non-toxic material.
Medium proportion of VA
The EVA copolymer, which has 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 a rubber or of plasticized polyvinyl chloride particularly at the higher end of the range. May be filled and both filled and unfilled materials have good low temperature properties and are tough.
High proportion of VA
The EVA copolymer, based on a high proportion of VA (greater than 40%), is referred to as ethylene-vinyl acetate rubber.
Conclusion – EVA
EVA is an elastomeric polymer that produces materials, which are “rubber-like” in softness and flexibility. The material has good low-temperature toughness, stress-crack resistance, hot and resistance to UV radiation.
Eva formulations are cured (crosslinked normally with peroxides) they have good weathering, ozone resistance and are Sulphur free. Eva foams are available in very low densities under two PCF up to solid 60 PCF and up.
High density EVA foam sheet offers unique design capabilities. High-density EVA foam as stiff as a pretzel or as flexible as macaroni is one of the many unique design capabilities available to the design engineer. Explore the treasure trove of possibilities for product performance. High-density EVA foam in sheets, rolls, foam tape and buns.
FREE TECH SUPPORT
JUST ASK JOHN
TOLL FREE PHONE
EVA Foam Tech Support
MONMOUTH RUBBER & PLASTICS CORP
75 Long Branch Avenue, Long Branch, N.J. 07740 USA