... flat washers, rubber Circles, Gaskets, engine parts and accessories,compression mold , etc. 4. Certification:ISO9002:2009, TS16949 ,NSF ,ACS .WRC ... can be make on your requirement ,but o-ring's mold fee is free.Company Name: Best Ring Technology Co. ... Seal Test Bed,Rubber Brittle Low-Temperature Test Bed, Aging Test, Thickness Meter, Shore-A Hardness Tester, Optical Projector ptfe mechanical ring seal ...