P / S Class B is an aircraft integrated fuel tank sealant. Service temperature range from 65 ° F (-54 ° C) to 250 ° F (121 ° C) with intermittent trips up to 135 ° C (275 ° F). This material is designed for backfill sealing of fuel tanks and other airframe sealing applications. The cured sealant retains excellent elastomeric properties after prolonged exposure to both jet fuel and aircraft gas.

P / S 890 Class B is a two part, manganese dioxide cured polysulfide compound. Uncured material is a low sag, thixotropic putty suitable for application by extrusion gun or spatula. Cures at room temperature to form a flexible sealant with excellent adhesion to common aircraft surfaces.