Standard_Parts_Catalogue

Page 2162 | Material Characteristics Elastomers Symbol NR CR FPM, FKM Trade name 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 Tensile strength in N/mm 2 – 25 20 Wear resistance / Abrasion resistance good good good Resistance to: * • Oil, greases • Solvents • Acid • Alkalines • Petrol • UV light / weather exposure - o o o - - + o + + - + + + + + + + General 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. 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 Material Characteristics of Plastics Materials and Elastomers continued 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