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 oneminute intervals until the container is
exhausted. The container shall be reweighted. 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
18.104.22.168 Specimen preparations
22.214.171.124.1 Specimens of the following metals shall be used in this test:
NOTE: Suggested specimen size is 3 x 1/2 x 1/16 inches.
126.96.36.199.2 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 188.8.131.52 and 184.108.40.206.
220.127.116.11 Test procedure. After weighing, the specimens shall be coated as specified in
18.104.22.168. 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.