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Page Title:
REPAIR OF DAMAGED FIBERGLASS EPOXY PARTS |
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|  TM
11-5820-919-40-1
WARNING
Using epoxy compound, empty the
3.
glass vial of catalyst and the syringe
Handling hot items presents a
of Epon into the aluminum cup and mix to
a complete homogeneous condition.
serious injury potential.
Asbestos gloves are required.
NOTE
The pot life of the epoxy mix-
Cure the coating in an oven set at
3.
ture is approximately 30 min-
165 F for 1-1/2 hours or by letting the
utes. All material not used
coating stand at room temperature for
24 hours.
within 30 minutes must be
discarded.
REPAIR OF DAMAGED FIBERGLASS
Damaged fiber glass parts
EPOXY PARTS.
4.
Immediately apply the epoxy mix-
may be repaired by performing the fol-
ture to the damaged area making sure to
lowing steps.
thoroughly wet the area to be repaired.
Apply sufficient material to cover
5.
NOTE
the entire area to be repaired.
Add a
small "crown" of material to allow for
For parts other than circuit
shrinkage.
boards, no more than 10 per-
cent of the surface area shall
WARNING
be repaired.
Handling hot items presents a
serious injury potential.
NOTE
Asbestos gloves are required.
For circuit boards, the area
Allow the repaired area to air
6.
to be repaired shall not
cure for 16 hours minimum or heat cure
exceed 1 square inch; the
in an oven for 1 hour at 150 10 F.
maximum depth of repair shall
not exceed 50 percent of the
Sand or scrape the crown of the
7.
original laminate thickness;
repair until the repair is relatively
misdrilled holes which do not
smooth and even with the original
interfere with the function of
laminate.
the circuit board shall remain
unrepaired; and minor cracks
MODIFICATION
OF
SOLDER-PLATED
which do not go through the
PRINTED WIRING CIRCUIT CARDS.
entire thickness of the
plated printed wiring circuit cards may
laminate may be repaired
be modified by brazing gold-plated
according to the following
copper wire to solder-plated copper
procedure.
conductors. The procedural steps are as
follows.
1.
Sand or scrape the area to be
NOTE
repaired using 80 to 180 grit sandpaper
or a scraper to remove all traces of
No more than two modification
burned or charred laminates. In the
jumper wires are allowed to be
case of a minor crack, scrape to the
brazed on one printed wiring
entire depth of the crack.
pad.
Joints are not allowed
on printed circuit conductors
2. Wipe the surface at least twice
that are less than the width
with a clean cloth wet with acetone and
of the coined (flattened)
allow to dry thoroughly.
jumper wire end.
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