PEVA Film and EVA Film

EVA and PEVA are the same thing. EVA film and PEVA film are both made from Ethylene Vinyl Acetate resin.

EVA is a copolymer which is comprised of the monomers Ethylene C2H4 and Vinyl Acetate Monomer CH2=CHOOCCH3 conjoined to make the copolymer Ethylene Vinyl Acetate, or EVA for short.

Somehow, the P (for polyethylene) was added on to create the acronym PEVA.

EVA is used for lots of things besides polyethylene film. This discussion pertains only to EVA film applications.

EVA cannot be added at the extruder. It is made at specific percentages by the resin companies.

EVA lowers the seal initiation temperature and melting point of PE film. In low percentages, it has been used for decades for enhanced sealability for bread bags (2% EVA to 3% EVA), ice bags (4% EVA) and frozen food packaging (usually 6% EVA). In higher percentages, more or less 20% EVA, it is used for low melt/total batch inclusion bags.

The higher percentage EVA, the lower the melting point whether measured as DSC melting point or vicat softening point.

Higher percentage EVA’s are soft and tacky.

EVA has a pungent, apple vinegar odor which can transfer to foods especially dairy products.

While EVA is considered obsolete by many for packaging applications because metallocene offers faster hot tack, demand for EVA remains strong for PVC replacement and solar panel encapsulation.