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