Westlake specializes in ethylene vinyl acetate eva formulations with vinyl acetate content that has expanded up to 28 appropriate for use in thermoplastic extrusion film compounds and foam molding.
Expanded vinyl acetate.
The eva copolymer which is based on a low proportion of va may be referred to as vinyl acetate modified polyethylene.
There are three different types of eva copolymer which differ in the vinyl acetate content and the way the materials are used.
Eva is one of the materials popularly known as expanded rubber or foam rubber.
It is a copolymer and is processed as a thermoplastics mater.
The major industrial route involves the reaction of ethylene and acetic acid with oxygen in the presence of a palladium catalyst.
Ethylene vinyl acetate or eva material is an elasticized closed cell foam with rubber like softness and flexibility.
This is therefore significantly higher than comparable particle foams such as expanded polypropylene epp at 30 ethylene vinyl acetate eva at 37 or expanded polyethylene epe at 50.
With softness and flexibility approaching elastomeric materials eva has good clarity and gloss barrier properties low temperature toughness stress crack resistance and ultraviolet uv resistance.
Eva foam is used as padding in equipment for various sports such as ski boots hockey boxing mixed martial arts wakeboard boots and waterski boots.
Eva foam is also waterproof.
The weight percent of vinyl acetate usually varies from 10 to 40 with the remainder being ethylene.
It is typically used as a shock absorber in sports shoes for example.
Tests of its resilience elasticity under iso 8307 the ball rebound test show thatinfinergy achieves a rebound of over 57.
It also is used in adhesives.
Polyvinyl acetate pvac a synthetic resin prepared by the polymerization of vinyl acetate.
In its most important application polyvinyl acetate serves as the film forming ingredient in water based latex paints.
1 acetoxyethylene ethenyl acetate ethenyl ethanoate vac vinyl acetate monomer vinyl ethanoate cas no.
Vinyl acetate c4h6o2 cid 7904 structure chemical names physical and chemical properties classification patents literature biological activities safety.
While the eva foam does not contain any rubber is is commonly referred to as expanded rubber or foam rubber.
Ethylene vinyl acetate also known as poly is the copolymer of ethylene and vinyl acetate.
Dot id guide.
Since vinyl alcohol is highly unstable with respect to acetaldehyde the preparation of vinyl acetate is more complex than the synthesis of other acetate esters.
Eva foam is a great option for cooler lids personal water craft surfboards stand up paddleboards or anywhere else you might want cushioned wet traction.
Eva mats will have a glossy appearance and are resistant to uv radiation and cracking.
