Hygienic_Design

Page 38 | Material characteristics Elastomers Symbol EPDM H-NBR TPU Trade name - - Desmopan ® / Elastollan ® Chemical description Ethylene propylene diene rubber Hydrogenated acrylonitrile butadiene rubber Thermoplastic polyurethane Hardness (Shore A) 70 … 85 85 55 ... 85 Temperature resistance • short-term • long-term – 40° … +150 °C – 40° … +120 °C - – 25° … +150 °C –50° ... +120 °C –30° ... + 90 °C Tensile strength in N/mm 2 14 11 50 Wear resistance / Abrasion resistance very good good very good Resistance to: * • Oil, greases • Solvents • Acid • Alkalines • Petrol • UV light / weather exposure - o + + - + + + o + + + + - - o o + General 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 environmental influences as well as acids and alkalines. The material is used in sealings and tubings. 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. TPU has generally good physical properties, making it ideal for demanding applications in virtually all industrial areas. In addition to the very high wear and abrasion resistance, the excellent tear growth resistance and cold flexibility of the ma- terial at low temperatures should also be mentioned. TPU can be made for a lar- ge hardness range and from an ergonomic point of view it can also be used advantageously due to its good surface feel (Softline!). * + resistant, o conditionally resistant, – non-resistant Material Characteristics of Elastomers Hardness data of vulcanized or thermoplastic elastomers are measured using the Shore scale. This value is determined by measuring the indention depth of a spring-loaded indenter into the material. A low indention depth is a high Shore value, a high indention depth a low Shore value. Different indenter shapes are used depending on the materials being examined. The elastomer materials used in Ganter products are measured according to “Shore A” with a blunt indenter with a tip angle of 35°. Information of hardness data for Elastomers