Since the introduction of ethylene propylene elastomers over 25 years ago, their importance has grown almost exponentially and, today, EPDM is used in a wide range of applications. The spectacular growth of EPDM is quantified by an average growth rate (over the last 10 years) of around 11% per annum. EPDM ranks third among the synthetic rubbers in importance, immediately after SBR and BR. This progression can be attributed to its unique end-use performance in highly filled rubber applications, along with excellent ozone and weathering resistance.