Figure 25. Composite lead-steel washer following external pressurization of test 

 assembly to 3,000 psi. The lead has plastically conformed to the con- 

 figuration of the glass pipe end flange and its integral 0-ring groove. 



Figure 26. Component parts of an experimental test assembly used to test 

 the seal provided by an aluminum washer interposed between 

 the glass pipe end flanges and the metal end-closure plates. 



26 



