Just my 2 cents here. Remember "EVERYTHING" leaks. It is just what is the leak rate. Just for an example here...If I take a lets say pneumatic coupling cap one end off and energize the other end with compressed air to 100 psi I would watch the coupling and time 15 seconds and did not achieve a...
Could you share the application? If we knew what you were trying to test it could be helpful. I work in a lab and test low pressures to high (50,000) along with some work with vacuum.