MIL-L-87177A
4.6.3 Determination of solubility in Freon TF. At least three dip clean coated test panels shall be dipped in boiling 95 percent methanol and let stand for one hour. After one hour, the test panels shall be rinsed twice with fresh Freon TF and examined visually. There shall be no visible residue on panels.
4.6.4 Leakage test. The pressurized container shall be completely submerged for five minutes in water maintained at 130°F + 2°F during which it shall be observed for the emission of bubbles. Distortion of the container or the emission of bubbles from any part of the container shall be considered evidence of leakage.
4.6.5 Determination of container weight. A sample container shall be weighed and then shall be sprayed at three minute periods with one-minute intervals until the container is exhausted. The container shall be re-weighted. The net difference shall be at least 16 ounces by weight.
4.6.6 Performance of pressurized containers. Panels as described in 4.6.1 shall be used. A panel shall be supported such that the longer dimension forms a 45 degree angle with the horizontal. Type I packaged in accordance with 5.2.1 shall be sprayed on the panel from a distance of 12 inches. The panel shall be examined for uniformity of spray, foaming, and adherence to the substrate. After a 10 second pause the same panel shall be resprayed and examined for adhesion and sagging. After a 5 second pause the same panel shall be resprayed again and likewise examined.
4.6.7 Grade A - corrosivity test
4.6.7.1 Specimen preparations
4.6.7.1.1 Specimens of the following metals shall be used in this test:
Magnesium, QQ-M-44
Cadmium, A-A-51126
Zinc, MIL-A-18001
Aluminum, QQ-A-250/4
Copper, QQ-C-576
Brass, QQ-B-626
NOTE: Suggested specimen size is 3 x 1/2 x 1/16 inches.
4.6.7.1.2 Specimen procedure. Three specimens of each of the above metals shall be polished to remove pits, burrs, and irregularities from all faces and edges. The panels shall be finished and cleaned as specified in 4.3.2.3 and 4.3.2.4.
4.6.7.2 Test procedure. After weighing, the specimens shall be coated as specified in
4.3.2.5. After a one hour drying period the specimens shall be placed in a humidity chamber maintained at 130°F +2°F and 75 percent relative humidity for seven days (168 hours). Upon completion the coating and any loose corrosion products shall be removed by cleaning in acetone. Reweigh the specimens and calculate the weight loss or gain in milligrams per square centimeter. The specimens shall meet the
requirements of 3.4.3.
4.6.8 Grade B - corrosion resistance test. The corrosion resistance test shall be conducted in accordance with the procedure specified in ASTM B 117 to determine conformance with 3.4.4.
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