... . Description of Aging-proof Flat O-ring with High Quality:1. Materials: can be NR flat o-ring, HNBR, Buna, FVMQ, MVQ ... pink thick o ring, etc. or upon your color codes. 6. Processing: all manufacturing processes are complied with ISO9001:2008. ... , KTW, WRAS, LFGB, etc. 8. Applications: automobile flat o-ring, electrical appliance, mechanical, industrial, construction, household, medical and other ...