PS-890 Class C is 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 and fay sealing of fuel tanks and other aircraft fuselage sealing applications. PS-890 Class C is a two-part, manganese dioxide cured polysulfide compound. Features: 1.The cured sealant maintains excellent elastomeric properties after prolonged exposure to both jet fuel and aviation gas. 2. The uncured material is a roller grade liquid suitable for application by brush, extrusion gun or spatula. 3. It cures at room temperature to form a resilient sealant having excellent adhesion to common aircraft substrates.