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EVA material and heat shrink tube

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Industry information

Release Time:2021.05.22

EVA material is a common name we define, it is ethylene-vinyl acetate copolymer. Compared with polyethylene, EVA is widely used in heat shrinkable tubes due to the introduction of vinyl acetate monomer in the molecular chain, which reduces high crystallinity, improves flexibility, impact resistance, filler compatibility and heat sealing , functional shed film, packaging film, hot melt adhesive, wire and cable and toys and other fields.

EVA material is a common name we define, it is ethylene-vinyl acetate copolymer. Compared with polyethylene, EVA is widely used in heat shrinkable tubes due to the introduction of vinyl acetate monomer in the molecular chain, which reduces high crystallinity, improves flexibility, impact resistance, filler compatibility and heat sealing , functional shed film, packaging film, hot melt adhesive, wire and cable and toys and other fields.

Generally speaking, the performance of EVA mainly depends on the content of vinyl acetate (VA) in the molecular chain. According to the content of vinyl acetate, ethylene and vinyl acetate copolymers are divided into EVA resin, EVA rubber and EVA emulsion. Products with a vinyl acetate content of less than 40% are EVA resins; products with a vinyl acetate content of 40%-70% are very flexible and elastic, and EVA resins in this content range are sometimes called EVA rubber; vinyl acetate content of 70% In the range of -95%, it is usually in the state of emulsion, called EVA emulsion.

EVA material has good tolerance and cross-linkability, because of its properties, it is very suitable for the production of heat shrinkable tubes. As the main raw material for the production of heat shrinkable tubes, the quality of eva material determines the first step in the quality of heat shrinkable tubes.

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