PR-1422 Class A – B are an aircraft integral fuel tank sealant. 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 brush sealing of fasteners in fuel tanks and other aircraft fuselage sealing applications. The cured sealant maintains excellent elastomeric proper- ties after prolonged exposure to both jet fuel and avi- ation gas. PR-1422 Class A is a two-part, dichromate cured polysulfide compound. The uncured material is suit- able for application by brush in thickness up to 25 mils. It cures at room temperature to form a resilient sealant having excellent adhesion to common air- craft substrates.

The following tests are in accordance with AMS-S- 8802 Class A specification test methods.