Views: 8 Author: Site Editor Publish Time: 2020-01-16 Origin: Site
Ethylene-vinyl acetate (EVA), also referred to as poly (ethylene-vinyl acetate) (PEVA), is that the copolymer of ethylene and vinyl acetate. the load percent vinyl acetate usually varies from 10 to 40%, with the rest being ethylene.
Broadly speaking, there are three differing types of EVA copolymer, which differ within the vinyl acetate (VA) content and therefore the way the materials are used.
The EVA copolymer which is predicated on a coffee proportion of VA (approximately up to 4%) could also be mentioned as vinyl acetate modified polyethylene. it's a copolymer and is processed as a thermoplastics material – a bit like rarity polyethylene. it's a number of the properties of a coffee density polyethylene but increased gloss (useful for film), softness and adaptability . the fabric is usually considered non-toxic.
The EVA copolymer which is predicated on a medium proportion of VA (approximately 4 to 30%) is mentioned as thermoplastic ethylene-vinyl acetate copolymer and may be a thermoplastic elastomer material. it's not vulcanized but has a number of the properties of a rubber or of plasticized PVC particularly at the upper end of the range. Both filled and unfilled EVA materials have good coldness properties and are tough. The materials with approximately 11% VA are used as hot melt adhesives.
The EVA copolymer which is predicated on a high proportion of VA (greater than 60%) is mentioned as ethylene-vinyl acetate rubber.
EVA is an elastomeric polymer that produces materials which are "rubber-like" in softness and adaptability . the fabric has good clarity and gloss, low-temperature toughness, stress-crack resistance, hot-melt adhesive waterproof properties, and resistance to UV radiation. EVA features a distinctive vinegar-like odor and is competitive with rubber and vinyl resin products in many electrical applications.