Eva Ethylene Vinyl Acetate

Ethylene vinyl acetate copolymer eva properties and applications.

Eva ethylene vinyl acetate.

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

In the solar industry the most common encapsulation is with cross linkable ethylene vinyl acetate eva. Eva is the abbreviation for ethylene vinyl acetate eva films are a key material used for traditional solar panel lamination. 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. Ethylene vinyl acetate or eva is a copolymer of ethylene and vinyl acetate with a structure as shown below.

It is an extremely elastic and tough thermoplastic of excellent clarity and gloss and with little odor. What are ethylene vinyl acetate eva films. 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 is a type of plastic a polymer with a wide variety of uses both residential and industrial.

It is the basis of many hot melt adhesives when blended with a petroleum wax and a resin tackifier. Ethylene vinyl acetate eva is a random copolymer of ethylene and varying amounts of vinyl acetate va. As the va content increases crystallinity decreases until at 50 the eva is. Eva is used in several applications thanks to the varied properties it possesses.

Eva shows good barrier and stretch properties. Ethylene vinyl acetate properties ethylene vinyl acetate is a flexible and transparent thermoplastic. Also it imparts plastic like properties that enable wax to compete effectively with high quality polymeric coatings. The va comonomer interferes with chain packing reducing crystallinity and thus lowering t m and improving transparency when compared with ldpe.

Ethylene vinyl acetate eva is a copolymer that is manufactured from ethylene and vinyl acetate monomer vam. Eva ethylene vinyl acetate this copolymer resin can be used in adhesives sealants and coatings.