Welding/cutting torch packing seals.

[Dr Stan]

(09-07-2019, 07:59 AM)rleete Wrote: The Teflon that McMaster sells is quite hard.  I have some, and while it machines fairly well, it's not soft, like Delrin.

I would think that you would want something softer for the packing, to kind of "squish" around the stem as you tighten the packing nut.

There are different grades of Teflon and McMaster carries some of them.  You may want to consider Durable PFA.  Just a thought.