Eva compounds, a patent invention that involves ‘injection molding’ concept for soles which have a treading surface of different colors, and which require cross-linking of two different types of granules for better expansion. ‘EVA’ has 4-60% of ‘vinyl-acetate ethylene copolymer’, which depends on the kind of addictive used for injection molding.
This addictive could either be cross-linking, expansible or thermoplastic. The permeability on EVA compounds is lower, making it advantageous for some products. The higher the vinyl-acetate content in these compounds, the lower the tensile strength, stiffness and softness would be; however, its permeability and toughness increase. These compounds are non-toxic, chemically stable and biocompatible.
