حلقات O من السيليكون | AS568-448 | داش 448 | متوافقة مع FDA | صلابة 70 | أحمر (7 / عبوة)

Finally found o-rings that can handle the heat cycling in our lab equipment without cracking. These red silicone ones fit the AS568-448 groove perfectly and have held up through several 400°F sterilization runs already.

Installed these on a hot water valve at my plant and they handled the 300°F steam without any softening at all. The 70 durometer feels firmer than standard rubber, which is exactly what I needed for a high-temp sealing application.

The red coloring makes them easy to spot when I'm swapping parts on the rig, and the silicone feels pliable yet firm at 70 durometer. Took them from the freezer to the oven without any cracking, which is exactly what I needed from the -80°F to +450°F range. Solid little pack of seven for the price.