... specially produce the o-ring,x-ring.rubber parts 2. Material: FFKM,NBR, HNBR,EPDM,SI,FKM(VITON)CR,PU,PTFE,ACR(A) 1 ... Tensile Machine, Rotary Oil Seal Test Bed, Rubber Brittle Low-Temperature Test Bed, Aging Test, Thickness Meter, Shore-A Hardness Tester ... Test Bed,Rubber Brittle Low-Temperature Test Bed, Aging Test, Thickness Meter, Shore-A Hardness Tester, Optical Projector ptfe mechanical ring seal