حلقات O-Ring PTFE 0.139" CS × 1.421" ID | AS568-221 | داش 221 | صلابة 22 (300/عبوة)

I needed a seal that could handle extreme cryo temps, and these PTFE o-rings fit the dash 221 size perfectly on my vacuum flange. They held up without any sign of brittleness during a liquid nitrogen test, which is exactly what I was hoping for.

Finally, o-rings that don’t deform under heat. I’ve used these in a steam application and the -350°F to +500°F range is no joke—they held their shape perfectly after hours of cycling. The 22 durometer gives them a nice, pliable feel that seals better than the harder stuff I’ve tried.

These arrived well-packed and the 22 durometer PTFE feels dense enough for my high-temp application. So far they’re holding up perfectly against both chemical exposure and the temperature swings I need.