... medium excellent performance, the main do oil seal and o-rings.Performance1.High temperature and ageing resistance.2.Vacuum performance is ... have kinds of material : SBR,CR,NBR,HNBR,EPDM,SILICONE,VITON,NR,FFPM,etc.2.We offer OEM, We ... ect. Item nameO ringsSizeCustomized/standard and nonstandardBrand NameO rings MaterialNBR,HNBR,EPDM,SILICONE,VITON,FLS,FFPM,PTFETemperatureCommon: 20~50degree centigrade; ...