MIL-C-47244A (MI)
4.4.2 Sampling. Unless otherwise specified (see 6.2), 1 pint of resin and 1 pint
of curing agent from one unit representative of each lot shall be selected at random for
quality conformance testing. Each container of resin and curing agent shall be
considered as a unit of product. Failure of sample to meet the quality conformance
requirements shall be cause for lot rejection.
4.5 Test methods.
4.5.1 Test conditions. Unless otherwise specified in the applicable test, all
tests shall be performed at room temperature and at relative humidity between 40 and
60 percent.
4.5.2 Test panels. Unless otherwise specified in the applicable test, test panels
shall consist of 9.50 inch squares of 0.50 inch thick aluminum conforming QQ-A-
250/12, with the resin system applied to centered 5 inch squares on each aluminum
square.
4.5.2.1 Precleaning. Prior to application of the resin system, the aluminum
squares shall be cleaned by abrading the surface with 108 to 200 grit sandpaper,
washed with methyl ethyl ketone (MEK) solvent conforming to ASTM D 740 and
allowed to dry for 20 minutes, minimum.
4.5.2.2 Primer. A primer conforming to MIL-P-47215 shall be brush-coated on
the cleaned aluminum squares and allowed to air-dry for not less than 30 minutes.
4.5.2.3 Application of resin system. The quantity of resin system required for
testing, not less than 90 grams (g) of base resin, shall be mixed thoroughly in the
proportion specified in 3.2 in not longer than 5 minutes, preferably by a standardized
mechanical mixing method. Unless otherwise specified, the test panels shall have the
resin system troweled on the aluminum squares to a thickness of not less than 0.165
inch nor more than 0.205 inch and cured at room temperature for 7 days. Except for
the hardness tests (see 4.6.5), the resin system shall be tested within 3 days after cure.
4.6 Physical property tests.
4.6.1 Appearance. The appearance of the resin system shall be checked
visually and shall be as specified in 3.3.1.
4.6.2 Specific gravity. The specific gravity of the resin system shall be
determined in accordance with ASTM D 792 and shall be as specified in 3.3.2.
4.6.3 Application time. With the base resin, curing agent, and compound
application gun stabilized at the conditions specified in 4.5.1 for not less than 8 hours,
90 grams or more of base resin shall be mixed thoroughly with the curing agent in the
proportion specified in 3.2. The mixed resin system shall be promptly used to fill a
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