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>Based on observations in the chemical industry involving oxygen
>applications,  the fact that every resource on materials compatibilty I have
>ever seen says viton is superior to buna-n in oxygen service and the fact
>that viton o-rings are only slightly more expensive than buna-n,if any at
>all, I wonder, why not use viton?

Viton does decompose at high temps to a sticky residue containing some sort of
Flouric acid.  We had a warning message sent round, stating that the only cure
for skin contact was amputation of the affected area.

I guess its ok as long as you know.

Bill.Dyer@mi*.co*.uk*

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