PS 890 Class A Fuel Tank Sealant. PPG Aerospace® Sealants
PS 890 A is an aircraft integral fuel tank sealant. It has a service temperature range from -55°C to 120°C, with intermittent excursions up to 135°C. This material is designed for brush and fay sealing of fuel tanks and other aircraft fuselage sealing applications. The cured sealant maintains excellent elastomeric properties after prolonged exposure to both jet fuel and aviation gas. PS 890 A is a two-part, manganese dioxide cured polysulfide compound. The uncured material is suitable for application by brush. It cures at room temperature to form a resilient sealant having excellent adhesion to common aircraft substrates.