EVA resin stands for ethylene-vinyl acetate copolymer.
Differences Between EVA and PE
The vinyl acetate (VA) content normally falls between 5% and 40%.
Unlike polyethylene (PE), EVA introduces vinyl acetate monomers into its molecular chain. This lowers crystallinity and enhances flexibility, impact strength, filler compatibility and heat-sealing capability.
It finds extensive applications in foamed shoe materials, functional greenhouse films, packaging films, hot melt adhesives, wires and cables, toys and many other sectors.
How VA Content Affects EVA Performance
In general, the overall properties of EVA resin are determined largely by the vinyl acetate content on its molecular chain.
Classification of EVA
Based on VA (vinyl acetate) content, EVA (ethylene-vinyl acetate copolymer) is split into three main grades:
- 5%–40% VA: EVA Resin Mainly used for PE modification, wire & cable compounds, films and other molded goods and blends.
- 40%–70% VA: EVA Elastomer Applied as rubber elastomers and modifiers for PVC.
- 70%–95% VA: VAE Emulsion Supplied in emulsion form, widely used for adhesives and coating systems.
EVA resin used for film production has VA content lower than 20%.
EVA films offer high transparency, outstanding impact toughness, good thermal stability, food-safe property, air permeability and low shrinkage at low temperatures.
For agricultural functional greenhouse films, EVA boasts high light transmission, reliable heat retention, ageing resistance and anti-fog & anti-drip performance, which makes it a preferred base resin for agricultural films.
In addition, EVA can be manufactured into packaging films, medical films, laminating films, casting films and other film varieties.
