حلقات O-Ring من PTFE مقاس 0.139 بوصة CS × 1.046 بوصة ID | AS568-215 | داش 215 | صلابة 21 (50 / عبوة)

The 21 durometer is noticeably softer than standard PTFE, which made seating these in a tight gland much easier without cracking. Install went smoothly and they haven't leaked a drop in our cryogenic test rig so far.

These fit perfectly in my cryogenic valve assembly where standard rubber would shatter. The 21 durometer hardness is surprisingly pliable for a PTFE ring, making installation much easier than I anticipated.

I needed o-rings that could handle extreme temperatures for a high-heat gasket repair, and these PTFE ones rated up to 500°F are exactly what the job required. The 21 durometer is noticeably soft and pliable, yet they seated perfectly in the groove without any struggle.