P/S 890 Class A 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. The cured
sealant maintains excellent elastomeric properties
after prolonged exposure to both jet fuel and aviation
gas.
P/S 890 Class A is a two-part, manganese dioxide
cured polysulfide compound. The uncured material is
suitable for application by brush in thickness up to 25
mils. It cures at room temperature to form a resilient
sealant having excellent adhesion to common aircraft
substrates.
The following tests are in accordance with AMS-S8802 Class A specification test methods.
