... seal and dynamic seal, main material contains: NR, CR, NBR, SBR, VITON, SILICON, HNBR,etc.square ring rubber Item namesquare ... ring rubberMaterialNBR,HNBR,EPDM,SILICONE,VITON,NR,CR,SBR,PUHardness30-100 shore ASizeCustomized/standard/nonstandardColorRed, Black, White, ... Clear, etcTemperatureCommon: -20~100degree centigrade;NBR(-40~120°C),SILICONE(-30~250°C),VITON(-25~200 ...