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Ok . Viton is fine for Orings but should not be used as gasket material where there is any chance of it getting burnt /overheated! it is Flourosilicate rubber anad if burnt produces Hydroflouric acid[ this etches glass and human flesh and doesnt wash off!!!!]. Go to a gasket supplier and you should be able to buy a 1mm thick sheeting , faced both sides with graphite powder and made from rag/ polymer, excellent sealing and will lift off metal faces without leaving crud.

Gordon.
 
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