MIL-PRF-24635E
3.5.22 Water resistance. The coating system shall show no blistering or wrinkling when examined immediately
after removal from distilled water. When examined 2 hours after removal, there shall be no softening, whitening, or
dulling. After 24 hours of air-drying, the portion of the panel that was immersed shall be indistinguishable with
regard to adhesion and general appearance from a panel prepared at the same time but not immersed, and shall retain
at least 90 percent of the 60-degree specular gloss of the panel before immersion or any other panel made from the
same batch.
3.5.23 Accelerated weathering.
3.5.23.1 Types II, III, and IV coatings. The coating system shall show no evidence of chalking and a loss of
not greater than 35 percent of the gloss measured before exposure. The color difference (ĆЕ) shall be not greater
than 1.0 CIELAB units from the original values measured before exposure.
3.5.23.2 Types V and VI coatings. The coating system shall show no evidence of chalking and a loss of not
greater than 10 percent of the gloss measured before exposure. The color difference (ĆЕ) shall not be greater than
0.5 CIELAB units from the original values measured before exposure.
3.5.24 Anti-stain properties (grade C only). The length of the longest running rust stain from the holiday on
two of the three test panels shall not be greater than the length of the longest running rust stain on the control panel.
3.5.25 Long-term exterior exposure.
3.5.25.1 Types II, III, and IV coatings. Coating systems shall meet the following requirements:
a.
60-degree gloss not less than 50 percent of that measured prior to testing.
b.
Chalking shall receive an ASTM D4214 rating not less than number eight of figure 2.
c.
Checking shall receive an ASTM D660 rating not less than nine (1 percent).
d.
Cracking shall receive an ASTM D661 rating not less than nine.
e.
Blistering shall receive an ASTM D714 rating not less than 10.
f.
When CIE color values of the exposed test panels are compared to the original CIE color values of the test
panel, the ASTM D2244 color difference calculated value, ΔE, shall be not greater than 2.0 CIELAB units.
g.
Tape test adhesion of the exposed coating shall achieve a minimum ASTM D3359 classification of 3A or
3B.
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