TM 1-1520-240-BD
NOTE
High
temperatures
and
humidity
shorten pot life of adhesives, low
temperatures will lengthen it.
(2)
No addition or omission of ingredients, or
deviation from mixing or blending procedures is
permitted.
(3)
Thinning of adhesives is not permitted
unless specifically allowed in the procedure.
(4)
All
multiple-part
adhesives
must
be
blended by weight, within 2-1/2 percent.
(5)
All
multiple-part
adhesives
must
be
blended in dean, metal, glass, polyethylene, or Teflon
containers only.
c.
Preparation of Bonding Surfaces. Unless
otherwise
specified,
all
bonding
surfaces
except
thermoplastic,
phenolic,
and
melamine,
must
be
thoroughly cleaned using dean cloths moistened with
methyl-ethyl-ketone. Thermoplastic, phenolic, and
melamine must be lightly sanded to remove the glass
and then cleaned with aliphatic naphtha.
d.
Application of Adhesive System No. 1.
WARNING
The adhesives under this system are
toxic and flammable. Work in well-
ventilated areas away from flame.
(1)
(Refer to Table 2-5 for the list of
acceptable adhesives.) Clean the faying surfaces using
methyl-ethyl-ketone.
(2)
Thoroughly stir adhesive in its own
container using a spatula.
NOTE
If adhesive is to be applied by
spraying, it may be thinned with
methyl-ethyl-ketone.
(3)
Brush or spray one coat of the adhesive
on each faying surface.
NOTE
On porous surfaces such as textiles
and wood, two coats must be
applied. The first coat must seal the
surface and be completely dry before
application of the second coat.
(4)
Allow adhesive to dry until tacky, then join
surfaces. Apply sufficient pressure to ensure solid
contact.
e.
Application of Adhesive System No. 3.
WARNING
The adhesives under this system are
toxic. Work only in well-ventilated
areas.
NOTE
The pot life is 40 minutes for
adhesive (item 39, Table 2-5) and 45
minutes for adhesive (item 40, Table
2-5).
(1)
(Refer to Table 2-5 for list of acceptable
adhesives.) Clean faying surfaces using naphtha.
(2)
Stir individual components in their own
container then blend them as follows:
(a)
If adhesive (item 39, Table 2-5) is
being used, blend 100 parts, by weight, of part A with 34
parts, by weight, of part B.
(b)
If adhesive (item 40, Table 2-5) is
being used, blend 100 parts, by weight, of part A with 40
parts, by weight, of part B.
(3)
Apply a coat of primer J (item 116, Table
2-5) to all surfaces except brass or neoprene. Use
primer H (item 115, Table 2-5) for brass or neoprene
surfaces. Allow primer to dry for 30 to 40 minutes.
NOTE
Primer
is
not
required
on
polycarbonate plastic surfaces.
(4)
Apply
the
adhesive
to
both
faying
surfaces using a brush or a spatula.
(5)
Join coated surfaces and apply light
pressure.
(6)
Allow adhesive (item 39, Table 2-5) to
cure for 3 days at 70°F (21 °C). Adhesive (item 40,
Table 2-5) cures in 2 days at same temperature.
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