P/S 890 Class B 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 fillet 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 B is a two-part, manganese dioxide cured
polysulfide compound. The uncured material is a low sag,
thixotropic paste suitable for application by extrusion gun
or spatula. 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-S-8802 Class
B specification test methods.
