MIL-PRF-24635E
FIGURE 2. Sample solar reflectance graph.
3.5.25.2 Types V and VI coatings. Coating systems shall meet the following requirements:
a.
60-degree gloss not less than 80 percent of that measured prior to testing.
Chalking shall receive an ASTM D4214 rating not less than number eight of figure 2.
b.
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 1.0 CIELAB units.
g.
Tape test adhesion of the exposed coating shall achieve a minimum ASTM D3359 classification of 3A or
3B.
3.5.26 Recoating. The coating system shall be able to be overcoated with the topcoat of the coating system
after being exposed for one year. Recoating of the exposed system shall produce no film irregularities. The
overcoat shall not wrinkle or lift any previous coat and shall dry to a smooth, uniform finish.
3.5.26.1 Types II, III, and IV coatings. Once fully cured in accordance with the manufacturer's ASTM F718
sheet, the overcoat applied to the exposed coating shall achieve a minimum ASTM D3359 classification of 3A or
3B.
3.5.26.2 Types V and VI coatings. Once fully cured in accordance with the manufacturer's ASTM F718 sheet,
the overcoat applied to the exposed coating shall achieve a minimum ASTM D3359 classification of 4A or 4B.
3.5.27 Serviceability. The coating shall show no deficiencies that would limit its serviceability when examined
during and after the minimum service period specified (see 4.5.27).
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