Class PR-1440 is an aircraft integrated fuel tank sealant. It has a service temperature range from -65 ° F (-54 ° C) to 250 ° F (121 ° C), and these intermittent trips go up to 275 ° (135 ° C). This material is designed for brush sealing fasteners in fuel tanks and other airframe sealing applications. The cured sealant retains excellent elastomeric properties after prolonged exposure to both jet fuel and aircraft gas.

PR-1440 Class A is a two part, manganese dioxide cured polysulfide compound. Uncured material is suitable for brush application up to 25 mil thickness. It cures at room temperature to form a flexible sealant with excellent adhesion to common aircraft surfaces.