... , metric o rings.Description of High Quality Standards O Ring for Chemical Resistant:1. Materials: can be standards o ring, HNBR, Buna ... , CSM, VITON, FKM, FPM, etc.2. Characteristics: good physical and chemical properties standards o ring. 3. Hardness: 30~90 shore A ... standards o ring, etc. or upon your color codes. 6. Processing: all manufacturing processes are complied with ISO9001:2008. 7. Material ...