... long use 3.many sizes 4.fast ship food grade silicone gasketFDA silicone o ring1)We have kinds of material : NBR, ... HNBR,EPDM,SILICONE,VITON,NRetc.2) High temperature and acid-alkali resistance, ... Item nameO RINGSizeCustomized/standard and nonstandardBrand Nameo ringMaterialNBR,HNBR,EPDM,SILICONE,VITON,TemperatureCommon: 20~50degree centigrade;NBR(-40~120C),ACM(- ...