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Corrosion Inhibitive Sealants

PR-2870 Class C-48 Non-Chromate Corrosion Inhibitive Sealant

PR-2870 Class C-48 is a non-chromate corrosion inhibitive sealant designed for use in fay surface applications. It has a service temperature range from -80°F (-62°C) to 250°F (121°C), with intermittent excursions up to 300°F (149°C). This material acts as an effective corrosion inhibitor when used with aluminum alloys or with dissimilar metals. The cured sealant maintains elastomeric properties after limited exposure to both jet fuel and aviation gasoline.

PR-2870 C-48 is a two-part, epoxy cured Permapol® P-3.1 polythioether compound. The uncured material is a liquid, suitable for application by brush, roller, extrusion gun or spatula. It cures at room temperature to form a resilient sealant having excellent adhesion to common aircraft substrates.


  • MIL-PRF-81733 - Type IV, Class 2, Grade B