Arno, You are right on with 0% leak over a period of time. I am looking for a leakage rate of less than 5,000 ppm oxygen over 10 years. Conservators have to keep their jobs! The NIST specifications are for less than 5,000 ppm oxygen leakage over 150 years. NIST used 6" plate for the titanium to...

I am here to ask for advise because I know that I do not know. I was taught that if you do not know ask someone who knows more than you. I was a frame maker/ restorer for some 30 years. I have always gotten my hands dirty. I have been designing a hermetically sealed box filled with argon gas for the...