gasket (viton)

 
 

Viton gaskets can be used instead of copper gaskets for temporary sealing. Their advantage is that they can be re-used. Their disadvantage is not necessarily that they are leaky (even though He gas diffuses through viton) but that they cannot be baked. Indeed, if you put viton gaskets in your system and keep them there for some time, it can easily happen that you bake them because you have forgotten. A good way to remember is therefore to close the flanges with fewer screws. Actually, you will not need as many screws as with the copper gaskets anyway because the viton gaskets will be compressed already when just pumping on the system with the roughing pump.

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