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Ethylene vinyl acetate (EVA)
0.75-4 usd/kg
Polymerising polyethylene with vinyl acetate (EVA) produces a very tough, rubber-like, semi-opaque thermoplastic with a relatively low upper working temperature. The vinyl acetate content is adjusted, according to the application, and as a result a range of properties can be achieved. EVA is utilised in moulding, extrusion, films, coatings, adhesives and foams.
Its inherent flexibility and toughness, combined with plasticiser-free chemistry, means it presents an attractive alternative to polyvinyl chloride (PVC) and polyurethane resin (PUR), in some cases.
As a thermoplastic, it is relatively easy to recycle with melt-processing techniques, such as compounding and extrusion. The difficulty with EVA is that it is often combined with other materials, and used as an adhesive interlayer, which makes it challenging, if not impossible, to recycle.
Sustainability concerns
Non-renewable ingredients
Raw material generates polluting by-products
Microplastics
Ethylene vinyl acetate (EVA) resin, used for injection moulding and extrusion, typically contains 5-30% vinyl acetate. As the proportion of vinyl acetate increases, crystallinity and shrinkage decreases, and it becomes more transparent. It is relatively easy to process, but is prone to high rates of shrinkage with unpredictable results. In practice, a test cavity may be required to produce mouldings using the correct conditions. The measurements from this determine the final dimensions of the production tooling.
It is used in applications ranging from footwear and packaging, to mouth guards, facial protection for impact sports and orthotics.
