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EPDM   (Ethylene Propylene Diene Monomer) Originally developed in 1950s for tyre applications. Became more widely used because of its suitability for outdoor use. Properties • the most water resistant type of rubber - also very resistant to most water based chemicals • very inert structure, remains stable over long periods of time • can withstand temperatures of up to 130°C for extended periods of time (months) • very good weathering resistance • easily compounded and processed Limitations • will not resist oil or oil based products • compression set not as good as some other rubbers, but can be improved by careful compounding Typical Applications General engineering without exposure to oil