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Is The EVA Material Plastic Or Rubber?

时间:2018-07-31 阅读: 1467

Is the EVA material plastic or rubber? EVA may be plastic or may be rubber depending on the VAC content.

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EVA packaging materials

When the content of vinyl acetate in EVA is less than 20%, it can be used as a plastic at this time. EVA (PA66) has good low temperature resistance, and its thermal decomposition temperature is low, about 230 °C. With the increase of molecular weight, the softening point of EVA rises, the processability and the gloss of the surface of plastic parts decrease, but the strength Increase, impact toughness and environmental stress cracking resistance are improved. EVA's chemical resistance and oil resistance are slightly worse than PE and PVC, and the change is more obvious with the increase of vinyl acetate content.

The EVA resin is an ethylene-vinyl acetate copolymer, and the content of vinyl acetate (VA) is generally 5% to 40%. Compared with polyethylene, EVA is widely used in foaming shoes 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 performance. Materials, functional shed film, packaging film, hot melt adhesive, wire and cable and toys.

In general, the performance of EVA resins depends primarily on the amount of vinyl acetate on the molecular chain. In the early years, the market consumption of EVA resin in China was about 290 kt. With the development of China's footwear industry and the increase in the amount of functional greenhouse film, the demand for EVA resin in China will increase year by year.

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