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helium super leak

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tope

Mechanical
Sep 14, 2001
6
I have a helium super leak that is too small to locate. Some suggested coating all the connections with the brand name Estane polyurethane. You mix 10 g Estane with 50 g methylene chloride and 50 g acetone and paint the solution on the suspected leak areas. Has anyone tried fixing a very small vacuum leak in this manner?
 
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I've not tried the Estane-poly method, but you may consider applying a thin coating of Stycast to the suspected area (Lakeshore carries the stuff).
 
I have experienced such a problem with a dewar feed leak several years ago.
We us a spray silicone product to seal the leak and it worked very well. I have looked on the internet to see if I could find the vendor, but no luck.
 
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