MIL-PRF-85322C
3.6.4 Odor. The odor of the coating, as packaged components, as an admixed coating, and as
a film after application, shall be characteristic of the solvents used, when tested as specified in
4.6. The air-dried coating shall retain no residual odor 72 hours after application.
3.7 Film properties.
3.7.1 Surface appearance. The coatings, applied to aluminum test panels in accordance
with 4.5.2.1, 4.5.2.3, and 4.5.2.4 (if applicable) shall be free of pinholes, cracks, bubbles, or
other film irregularities when visually examined under 10x magnification. Slight after-tack is
permissible.
3.7.2 Color. The coatings, applied to aluminum test panels in accordance with 4.5.2.1,
4.5.2.3, and 4.5.2.4 (if applicable) shall be a visual color match to the specified color chips
36375 (gray, but with a gloss finish) and 17038 (black) in FED-STD-595 (see 6.3.1 and 6.7.1),
when tested as specified in 4.6.
3.7.3 Drying time. The test coating(s), applied to test panels in accordance with 4.5.2.1,
4.5.2.3, and 4.5.2.4 (if applicable) shall dry hard within six hours, when tested as specified in 4.6.
3.7.4 Free-film strength. The free-film strength of the rain erosion coating shall be in
accordance with table I, when tested as specified in 4.6.4.
TABLE I. Free-film strength.
Characteristic
Requirement
Tensile Strength (minimum)
1000 psi
Elongation-at-break (minimum)
350 percent
3.7.5 Peel adhesion. The peel adhesion of the applied rain erosion test coating shall be a
minimum of 4 lbf/in (700 N/m) of width, when tested in accordance with 4.6.5. Breakage of the
film, without peeling from the test panel, at values less than 4 lbf/in (700 N/m) shall be
permissible.
3.7.6 Low-temperature flexibility. The rain erosion test coating, when tested in accordance
with 4.6.6, shall show no evidence of cracking or loss of adhesion.
3.8 Resistance properties.
3.8.1 Water resistance. The coating after immersion in water as specified in 4.6.7 shall
show no evidence of blistering, checking or visible color change.
3.8.2 Fluid resistance. When immersed in lubricating oil conforming to MIL-PRF-23699,
hydraulic fluid conforming to MIL-PRF-83282, and JP-5 conforming to MIL-DTL-5624, the
coating shall not exhibit blistering, softening, dark staining or other coating defects, when tested
as specified in 4.6.8.
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