Dupont Krytox

The Krytox NRT 8908 grease seems to be safe for pcp orings but I still wouldn't use anything but 100% silicone grease. This is what I use

https://www.amazon.com/gp/product/B007XAVC5M/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

Should be. We used it in anesthesia machines.

Depending on what part number, it's also used heavily in vacuum chambers, and vacuum furnaces.

So, that/those part numbers have to be clean and fireproof, and do no harm to the sealing o-rings in the chamber doors.

Mike

Dupont Krytox is my magic piston seal lube for my high end springers nothing I have found works better for me. So, yes it should Be fine for PCP’s. Been using it for years on springers.

This is what the big boys use in industry 

Another good product for dynamic orings in a PCP is Ultimox, I use it in my Cothran-valved guns, I've yet to disassemble a valve lubed with Ultimox and found the valve to be dry....

in static applications such as tube caps, barrel orings, etc using anything more than silicone/divers grease/dielectric grease is overkill....It won't hurt, but it's really not needed....