Eva Ethylene Vinyl Acetate Properties

Ethylene vinyl acetate copolymer eva properties and applications.

Eva ethylene vinyl acetate properties.

The properties are largely dependent on the molecular weight and the vinyl acetate content. Ethylene vinyl acetate eva is a random copolymer of ethylene and varying amounts of vinyl acetate va. Emblem in packaging technology 2012. It is an extremely elastic and tough thermoplastic of excellent clarity and gloss and with little odor.

Eva is used in several applications thanks to the varied properties it possesses. The graph bars on the material properties cards further below compare eva to. It is the basis of many hot melt adhesives when blended with a petroleum wax and a resin tackifier. There are three different types of eva copolymer which differ in the vinyl acetate va content and the way the materials are used.

The va comonomer interferes with chain packing reducing crystallinity and thus lowering t m and improving transparency when compared with ldpe. Eva ethylene vinyl acetate this copolymer resin can be used in adhesives sealants and coatings. It shows good chemical resistance. For more specific values follow the links immediately below.

1 the ethylene portion provides miscibility with ethylene copolymers while the vinyl acetate portion increases the. Ethylene vinyl acetate or eva is a copolymer of ethylene and vinyl acetate with a structure as shown below. The properties of eva include two common variations. Ethylene vinyl acetate offers good low temperature flexibility.

Ethylene vinyl acetate terpolymers eva mah are random copolymers of ethylene vinyl acetate and maleic anhydride produced by high pressure polymerization in tubular reactors. Eva shows good barrier and stretch properties. Ethylene copolymers top all thermoplastics middle and the entire database bottom. This page shows summary ranges across both of them.

Ethylene vinyl acetate eva copolymers are random linear copolymers produced by the copolymerization of ethylene and vinyl acetate va either in a high temperature and high pressure free radical process or for high vinyl acetate materials in emulsion. As the va content increases crystallinity decreases until at 50 the eva is. Ethylene vinyl acetate terpolymer ethylene vinyl acetate maleic anhydride properties and applications. Also it imparts plastic like properties that enable wax to compete effectively with high quality polymeric coatings.