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Is there anyone who can tell me from what material I can cut the first stage diaphragm? rubber sims to be too delicate.
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Great,They also make an insertion rubber sheet in Viton or Silcone
Viton A 70 Insertion Rubber Sheet - Premium - Reglin Rubber - Australian
Seems silicone rubber is more for high temperature applications
Silicone Insertion Rubber - Premium - Reglin Rubber - Australia
Thank you for all the tips learning on the fly, hopefully will get there wiser.Keep in mind that the diaphragm is not exposed to high pressure gas, only to intermediate pressure (about 9 Bar, or 130 psi). The O2 exposure is very limited.
I would use the Nitrile (Buna-N) for anything, except maybe 100% O2. And that only because I prefer an unbalanced piston for that application.
YMMV