Ganter Norm Standard Parts - Catalogue Page 2163
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Material Characteristics of Plastics Materials and Elastomers continued Elastomers Symbol NR Trade name CR FPM, FKM Neoprene ® Viton® Chemical description Natural rubber Chloroprene rubber Fluorine elastomer Fluorine rubber Hardness (Shore A) 30 … 90 30 … 90 65 … 90 Temperature resistance • short-term • long-term – 60° … +130 °C – 40° … + 80 °C – 30° … +150 °C – 25° … +100 °C – 30° … +280 °C – 20° … +230 °C – 25 20 good good good o o o - + o + + + + + + + + + NR is a material with very good physical properties and excellent mechanical strength. It is used e.g. for spring elements. CR is one of the most frequently used synthetic rubbers with a wide range of applications for parts which require exceptional resistance to ageing. FPM is unmatched for applications with contact to fuels, oils, solvents, as well as many acids and caustic solutions; resistant to atmospheric and environmental influences. Tensile strength in N/mm2 Wear resistance / Abrasion resistance Resistance to: * • Oil, greases • Solvents • Acid • Alkalines • Petrol • UV light / weather exposure General Due to its high price its use is restricted to high quality rubber parts which are exposed to extremely heavy wear resistance. Viton® is a registered trademark of DuPont performance rubbers. * + resistant, o conditionally resistant, – non-resistant Information of hardness data for 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°. Page 2162 | Material Characteristics
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