I'm trying to do an experiment on high pressure's effect on the electrical impedance of a really corrosive solution. I'm aiming for at least 2,000 psi with a pressure chamber but the only material I found that's chemically inert is PTFE and it's really limiting. One of my design is to use a PTFE diaphragm at the opening of the tube and press it inside the chamber to create pressure, and the other one is to push a PTFE piston into a tube directly but I don't know if it will hold much pressure.
The problem is that I can't really find a pre-made diaphragm that's under $500 that suits my chamber. Also, I can't find a way to fit a pressure gauge into the chamber and seal it properly. If you have an idea where to find these parts or any suggestions on how I should improve my design to better accommodate these challenges, that would be a great help. Thanks in advance!