Standard_Parts_Catalogue

| Material Characteristics Page 2163 Material Characteristics of Plastics Materials and Elastomers continued Elastomers Symbol NBR H-NBR EPDM Trade name Perbunan ® - - Chemical description Acrylonitrile butadiene rubber Hydrogenated acrylonitrile butadiene rubber Ethylene propylene diene rubber Hardness (Shore A) 25 … 95 85 70 … 85 Temperature resistance • short-term • long-term – 40° … +150 °C – 30° … +120 °C - – 25° … +150 °C – 40° … +150 °C – 40° … +120 °C Tensile strength in N/mm 2 25 11 14 Wear resistance / Abrasion resistance good good very good Resistance to: * • Oil, greases • Solvents • Acid • Alkalines • Petrol • UV light / weather exposure + o o + + - + + o + + + - o + + - + General NBR is a synthetic special rubber for rubber parts with high requirements for resistance to swelling when in contact with oils and fuels. Standard material for o-rings. H-NBR is obtained through full or partial hydrogenation of NBR. This significantly improves the resistance to heat, ozone and aging. The resulting materials are characterized by high mechanical strength and high abrasion resistance. Media resistance is comparable to NBR. EPDM is a synthetic all-purpose rubber characterized by its high steam and hot water resistance. Also worth mentioning are its outstanding resistance to aging, weathering and environ- mental influences as well as acids and alkalines. The material is used in sealings and tubings. * + resistant, o conditionally resistant, – non-resistant