PR-1422 Class B is an aircraft integral fuel tank sealant, MIL-S-8802, AMS-S-8802 Class B. It has a service temperature range from -65°F (-54°C) to 250°F (121°C), with intermittent excursions up to 275°F (135°C). This material is designed for fillet sealing of fuel tanks and other aircraft fuselage sealing applications. The cured sealant maintains excellent elastomeric properties after prolonged exposure to both jet fuel and aviation gas.
PR-1422 Class B aircraft fuel tank sealant, AMS-S-8802 and MIL-S-8802 Class B, is a two-part, dichromate cured polysulfide compound. The uncured material is a low sag, thixotropic paste suitable for application by extrusion gun or spatula. It cures at room emperature to form a resilient sealant having excellent adhesion to common aircraft substrates.
PR-1422 Class B Aircraft Fuel Tank Sealant is tested in accordance with AMS-S-8802 and MIL-S-8802 Class B specification test methods.