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At 50° C, the weight loss after 175 hours in vacuum is only 0.00001
grams/cm2 , compared to 0.01 grams/cm2 for epoxy
sealants. Residual gas analysis shows no evidence of hydrocarbons or other
contamination attributable to the use of Vacseal® being used on UHV systems
capable of attaining ultimate vacuums of 1x1012.
The curves in the graphs show the weight losses vs. time at 50 and 100° C for several commonly used materials in vacuum. Samples were placed in a thermal chamber at a pressure of less than 5 x 10-6 torr and at the temperature indicated. The silicone resin used in Vacseal® had a lower weight loss in vacuum than any other material tested. Indications of how well Vacseal® can effect a permanent seal in vacuum systems has been demonstrated repeatedly on systems capable of attaining ultimate pressures of below 1 x 10-12 torr after being baked at temperatures above 450° C. Steady State Weight loss of materials tested:
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