... have kinds of material : NBR,HNBR,EPDM,SILICONE,VITON,NRetc.2) High temperature and acid-alkali ... RINGSizeCustomized/standard and nonstandardBrand Nameo ringMaterialNBR,HNBR,EPDM,SILICONE,VITON,TemperatureCommon: 20~50degree centigrade;NBR(-40~ ... welcomeSPECIALFeaturesOil-resistant; heat resistant; abrasion-resistant;aging resistant; insulation; acid and alkaline resistant; airtight; shock absorption, ...