P / S 890 Class A is an aircraft integrated fuel tank sealant. It has a service temperature range of -65 ° F (-54 ° C) to 250 ° F (121 ° C) with intermittent trips up to 135 ° C (275 ° F).

This material is designed for brush and mud sealing of fuel tanks and other aircraft fuselage sealing applications. The cured sealant retains excellent elastomeric properties after prolonged exposure to both jet fuel and aircraft gas. 

P / S 890 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.