... ) Prompt delivery & top quality 4) Professional service. Features of our SBR rubber o ring:· Working temperature: -100 to +300 degrees;· Hardness ... & SGS certification;· Rubber Material: NBR, HNBR, XNBR, EPDM, CR, NR, SBR, VMQ, FKM, LAS, FVMQ, FFKM, PTFE, PU, ECO, IIR, ACR ... 1050LF, 4079, 6375, 7075Here are some photos for your reference: SBR rubber O ring