حلقات O-Ring من PTFE مقاس 0.139 بوصة CS × 0.796 بوصة ID | AS568-211 | داش 211 | صلابة 21 (50 / عبوة)

The chemical resistance of these PTFE rings is exactly what I needed for a harsh solvent application. They installed easily and have held their seal perfectly after several thermal cycles from -100°F to 300°F.

Finally, o-rings that don't deform after a hot oil bath — the PTFE holds up exactly as promised at 500°F. The 21-durometer feel is just pliable enough to seat perfectly in my sealing groove without being flimsy.

Used these to seal a vacuum chamber fitting and they held perfectly down to 5 microns, which I honestly didn’t expect from PTFE. The -350°F temp range gives me confidence for cryo experiments I’ve got planned next month.