Eva Ethylene Vinyl Acetate

Ethylene vinyl acetate copolymer eva properties and applications.

Eva ethylene vinyl acetate.

The va comonomer interferes with chain packing reducing crystallinity and thus lowering t m and improving transparency when compared with ldpe. Ethylene vinyl acetate properties ethylene vinyl acetate is a flexible and transparent thermoplastic. Ethylene vinyl acetate is a type of plastic a polymer with a wide variety of uses both residential and industrial. Ethylene vinyl acetate or eva is a copolymer of ethylene and vinyl acetate with a structure as shown below.

What are ethylene vinyl acetate eva films. Eva shows good barrier and stretch properties. With the help of a lamination machine the cells are laminated between films of eva in a vacuum which is under compression. Ethylene vinyl acetate offers good low temperature flexibility.

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. It is an extremely elastic and tough thermoplastic of excellent clarity and gloss and with little odor. Ethylene vinyl acetate eva is a copolymer that is manufactured from ethylene and vinyl acetate monomer vam. Eva is the abbreviation for ethylene vinyl acetate eva films are a key material used for traditional solar panel lamination.

As the va content increases crystallinity decreases until at 50 the eva is. Ethylene vinyl acetate eva is a random copolymer of ethylene and varying amounts of vinyl acetate va. Also it imparts plastic like properties that enable wax to compete effectively with high quality polymeric coatings. 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.

Emblem in packaging technology 2012. The main advantages of eva is that it has good toughness flexibility clarity and gloss the ability to withstand low temperatures and good tear resistance. It shows good chemical resistance. 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. In the solar industry the most common encapsulation is with cross linkable ethylene vinyl acetate eva.