... Quick shipment. 2. Large stock quantity. 3. Heat-proof flat o-ring. 4. AS568, BS, JIS, metric sizes all available. ... Description of Aging-proof Flat O-ring with High Quality:1. Materials: can be NR flat o-ring, HNBR, Buna, FVMQ, ... NSF, KTW, WRAS, LFGB, etc. 8. Applications: automobile flat o-ring, electrical appliance, mechanical, industrial, construction, household, medical and other ...