... delivery & top quality 4) Professional service Features of our rubber o ring:· Working temperature: -100 to +300 degrees;· Hardness: 25~95 Shore ... , XNBR, EPDM, CR, NR, SBR, VMQ, FKM, LAS, FVMQ, FFKM, PTFE, PU, ECO, IIR, ACR.· Color: Regularly black, red, blue, yellow ...