What Is Ethylene Vinyl Acetate

It has a sweet pleasant fruity smell but the odor may be sharp and irritating to some people.

What is ethylene vinyl acetate.

Vam is usually produced by the catalysed vapour phase reaction of acetic acid with ethylene and oxygen in a fixed bed tubular reactor using a supported noble metal catalyst. Ethylene vinyl acetate copolymer does not have an acid odor if it is not thermally degraded. The major industrial route involves the reaction of ethylene and acetic acid with oxygen in the presence of a palladium catalyst. This product should not be confused with the ethylene vinyl acetate eva copolymers.

Eva ethylene vinyl acetate this copolymer resin can be used in adhesives sealants and coatings. Vinyl acetate is the acetate ester of vinyl alcohol. 47 but elevated temperature and presence of some additives for example high amounts of clay cause the production of pungent acetic acid odor which is a product of thermal degradation of ethylene vinyl acetate copolymer. The food and drug administration fda has stated that ethylene vinyl acetate is safe when used in food production packaging or transportation and it s not an especially dangerous material.

It is a polymer that approaches elastomeric materials in softness and flexibility yet can be processed like other thermoplastics. Many different grades are manufactured with the vinyl acetate content varying from 5 to 50 percent by weight. Eva copolymers are more. Vinyl acetate is a clear colorless liquid.

It is the basis of many hot melt adhesives when blended with a petroleum wax and a resin tackifier. Ethylene vinyl acetate eva also known as poly ethylene vinyl acetate peva is the copolymer of ethylene and vinyl acetate the weight percent of vinyl acetate usually varies from 10 to 40 with the remainder being ethylene. You can easily smell vinyl acetate when it is in the air at levels around 0 5 ppm half a part of vinyl acetate in 1 million parts of air. Also it imparts plastic like properties that enable wax to compete effectively with high quality polymeric coatings.

Ethylene vinyl acetate is a type of plastic a polymer with a wide variety of uses both residential and industrial. It readily evaporates into air and dissolves easily in water. Ethylene is now the preferred feedstock for vam vinyl acetate monomer largely replacing the earlier acetylene based process. There are three different types of eva copolymer which differ in the vinyl acetate va content and the way the materials are used.

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.