... Prompt delivery & top quality 4) Professional service Features of our rubber o ring:· Working temperature: -100 to +300 degrees;· Hardness: 25 ... Strength, Wear and tear resistance, Durable;· UL & SGS certification;· Rubber Material: NBR, HNBR, XNBR, EPDM, CR, NR, SBR, VMQ ... IIR, ACR.· Color: Regularly black, red, blue, yellow for rubber material, for silicone, any colors are available according to your ...