حلقات O من PTFE | CS 0.139" × ID 1.109" | AS568-216 | داش 216 | صلابة 21 (35 / عبوة)

Finally, o-rings that actually stay put in my freezer applications without getting brittle. The 21 durometer makes them surprisingly flexible for PTFE, and the -212°C rating gives me total confidence. Already ordering another pack for the vibration rig.

I needed o-rings that could handle extreme temperatures for a cryo lab setup, and these PTFE ones with a durometer of 21 are just soft enough to seat without cracking. The 1.109" inner diameter fit the housing snugly, and the pack of 35 gives me plenty of spares for future adjustments.

The 0.139" cross-section fit perfectly into my groove, and the PTFE material feels much more rigid than the rubber ones I used to buy. These handled a harsh chemical test without any degradation.