Figure 4-36.—Applying sealant.
withdrawn. An example of injection sealing is the
caulking of a leaking fuel cell.
Fasteners, such as rivets, Rivnuts, screws, and
small bolts, should have a brush coat of sealant over
the protruding portion on the pressure side. Washers
should have a brush coat of sealant on both sides.
Split-type grommets should have sealant brushed into
the split before installation. After installation, fillets
should be applied to both the base of the grommet and
the protruding tube on the pressure side.
Sealing Compound (MIL-S-8802). MIL-S-8802 is
a temperature-resistant (-65°F to +250°F), two-
component, synthetic rubber compound used for
sealing and repairing fuel tanks and fuel-cell cavities.
It is produced in three classifications.
Class
Use
A
For brushing application
B
For extrusion gun and spatula
application
C
For faying surface sealing
Sealing Compound (MIL-S-81733). MIL-S-81733
is an accelerated, room-temperature curing, synthetic
rubber compound. It is used in sealing metal
components on weapons and aircraft systems for
protection against corrosion. This sealant contains a
corrosion inhibitor. Figure 4-37 shows MIL-S-81733
sealing compound used to seal an antenna. It comes in
four types.
Type
Applied by
Maximum application
time in hours
I
Brush
1/2
Dip
2
II
Extrusion
1/2
Gun
2
Spatula
4
III
Spray gun
1
IV
Brush or Spatula
12 to 48
Figure 4-37.—Typical fleet antenna sealing application.
4-53
