Gasket material for short-term hydrotest on carbon steel piping

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Charles M.

26 November 2025 at 17:09

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Looking for advice on selecting a gasket material for temporary spool joints during a hydrotest on carbon steel piping in a refinery. The test medium will be demineralized water (low conductivity, no additives), and the system will be drained afterward. We need to avoid materials that could leach ions or cause staining on the flange faces. What gasket material would you recommend for this short-term, low-pressure application?

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    Charles M.

    26 November 2025 at 17:09

    Looking for advice on selecting a gasket material for temporary spool joints during a hydrotest on carbon steel piping in a refinery. The test medium will be demineralized water (low conductivity, no additives), and the system will be drained afterward. We need to avoid materials that could leach ions or cause staining on the flange faces. What gasket material would you recommend for this short-term, low-pressure application?

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    Niall A.

    8 December 2025 at 16:47

    Hey Charles, Virgin PTFE or expanded PTFE (ePTFE) are your best bets for gasket material. Both are chemically inert, don’t leach metal ions, don’t shed graphite/fillers, and peel off cleanly without marking the flange. These characteristics make them great for hydrotesting in a refinery environment. Additionally, these materials conform well to flange surfaces to create a reliable seal that will not contaminate the hydrotest fluid.

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