What Is Ethylene Vinyl Acetate Made Of

There are three different types of eva copolymer which differ in the vinyl acetate va content and the way the materials are used.

What is ethylene vinyl acetate made of.

It readily evaporates into air and dissolves easily in water. Ethylene vinyl acetate is a type of plastic a polymer with a wide variety of uses both residential and industrial. 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 eva for instance is produced by the copolymerization of ethylene and vinyl acetate under pressure using free radical catalysts.

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. Other articles where ethylene vinyl acetate is discussed. 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. Vinyl acetate is the acetate ester of vinyl alcohol.

Depending on the mixture and the way of manufacturing eva can be made a number of shapes and molds. Ethylene vinyl acetate also known as 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. Several different types of eva are created where the vinyl acetate amount ranges from between 5 percent to 50 percent. So while little is known about ethylene vinyl acetate toxicity from the evidence available it does look like peva is a less harmful material than pvc.

The major industrial route involves the reaction of ethylene and acetic acid with oxygen in the presence of a palladium catalyst. Ethylene is now the preferred feedstock for vam vinyl acetate monomer largely replacing the earlier acetylene based process. 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.

It has a sweet pleasant fruity smell but the odor may be sharp and irritating to some people. Foam injection molding means that the hot liquid foam mixture of ethylene vinyl and acetate is sprayed into a mold. Vinyl acetate is a clear colorless liquid.