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Perflouroelastomers in Sulfuric Acid

Perflouroelastomers in Sulfuric Acid

Perflouroelastomers in Sulfuric Acid

(OP)
I am looking for an acceptable o-ring material to be used is a mechanical seal made of zirconium metals for a sulfuric acid application.  The process is sulfuric acid (67% concentration) at a temperature 250F.  I have tried various componds (Kalrez 6375 and Viton)with marginal success.  I am currently using Chemraz 615 based on a recommendation from Greene Tweed.  The o-ring itself actually performs pretty well.  The issue is that the zirconium parts are becoming corroded in the areas under the o-rings that are also in contact with sulfuric acid.  I understand that in sulfuric acid applications, zirconium corrosion rates are drastically affected by the presence of fluoride ions. Is there some other elastomer compound (not necessarily a perflouroelaster) that can handle hot sulfuric acid and not corrode zirconium at the same time?  

RE: Perflouroelastomers in Sulfuric Acid

You might try UHMWPE O-Rings.  There are available from Parker.

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