Eva Ethylene Vinyl Acetate Properties

Ethylene vinyl acetate offers good low temperature flexibility.

Eva ethylene vinyl acetate properties.

Ethylene vinyl acetate or eva is a copolymer of ethylene and vinyl acetate with a structure as shown below. The properties are largely dependent on the molecular weight and the vinyl acetate content. It shows good chemical resistance. The va comonomer interferes with chain packing reducing crystallinity and thus lowering t m and improving transparency when compared with ldpe.

It is an extremely elastic and tough thermoplastic of excellent clarity and gloss and with little odor. The properties of eva include two common variations. Ethylene vinyl acetate copolymer emulsion. Ethylene vinyl acetate terpolymer ethylene vinyl acetate maleic anhydride properties and applications.

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. This page shows summary ranges across both of them. Ethylene vinyl acetate eva is a random copolymer of ethylene and varying amounts of vinyl acetate va. The graph bars on the material properties cards further below compare eva to.

Emblem in packaging technology 2012. 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. Ethylene vinyl acetate terpolymers eva mah are random copolymers of ethylene vinyl acetate and maleic anhydride produced by high pressure polymerization in tubular reactors. Ethylene vinyl acetate properties ethylene vinyl acetate is a flexible and transparent thermoplastic.

It is the basis of many hot melt adhesives when blended with a petroleum wax and a resin tackifier. For more specific values follow the links immediately below. Eva is used in several applications thanks to the varied properties it possesses. There are three different types of eva copolymer which differ in the vinyl acetate va content and the way the materials are used.

Eva shows good barrier and stretch properties. As the va content increases crystallinity decreases until at 50 the eva is. Ethylene copolymers top all thermoplastics middle and the entire database bottom. Eva ethylene vinyl acetate this copolymer resin can be used in adhesives sealants and coatings.