Pemanfaatan limbah kopolimer ethyene vinyl acetateuntuk komposit karet

A new composite of natural rubber blend with ethylene vinyl acetate (EVA) waste obtained from footwear industry hase been made. EVA waste from footwear industry is crosslinked materials which is able to be used as a filler in composite rubber. Potency of EVA waste in the form of powder from the footwear industry in Indonesia is more than 50kg/day, while in the form of solid is about 75,000 ton/ year and is hasn’t yet utilized. The aim of this research is to study influence of EVA waste on the physical properties of natural rubber composite filled with EVA waste. Natural rubber, EVA waste, and addives were mixed by a two-roll mills machine. The amounts of EVA waste were varied from 0 to 100 phr with range of 20 phr. The results of physical properties test showed that the maximum addition of EVA waste, which performed highest tensile strength, and tear resistance was found for 60 phr, and which contributed to an increase in higher elongation at break, hardness, 50% permanent set, and density was found for 100 phr. The addition of EVA waste resulted in a reduction of the abrasion resistance. All of the resulted composites there were no crack detected on the flex cracking test at 150 kcs.