حلقات O من Viton FKM 0.103" قطر داخلي × 1.049" قطر خارجي | AS568-121 | داش 121 | صلابة 90 (250/عبوة)

Installed a set on a hot oil pump flange that's been eating standard Buna rings in weeks; the Viton held up perfectly through multiple 350°F cycles. The 90 durometer gives them a nice firm feel that doesn't squirm out of the groove under pressure.

Finally used these to rebuild a high-temp steam valve that kept leaking with standard Buna. The 90 durometer Viton feels much stiffer going on, but it seals perfectly and hasn't hardened after multiple cycles up to 400°F. Exactly what I needed for that application.

Installed these in a pneumatic actuator running near 350°F; they sealed perfectly with no leaks after a week of cycling. The 90 durometer feels noticeably firmer than standard Buna-N, which gives me confidence for long-term use.