... all available. Description of Good Performance O-ring Cord PAHS Approved:1. Materials: can be NR o-ring cord, HNBR, Buna, FVMQ, MVQ, ... , etc.2. Characteristics: good physical and chemical properties o-ring cord. 3. Hardness: 30~90 shore A or IRHD ... NSF, KTW, WRAS, LFGB, etc. 8. Applications: automobile o-ring cord, electrical appliance, mechanical, industrial, construction, household, medical and other ...