MIL-PRF-85285E
3.5.5 Moisture content (class H only). Component A shall contain no more than 2.0 percent
by weight of water when tested as specified in 4.6.
3.6 Liquid properties.
3.6.1 Fineness of grind. The fineness of grind (measured on the Hegman scale) of the
admixed coating shall be a minimum of 7 for gloss colors and a minimum of 5 for camouflage
(flat or lusterless) colors when tested as specified in 4.6.
3.6.2 Coarse particles. Coarse particles retained on a No. 325 sieve shall be no more than
0.5 percent by weight of the admixed coating when tested as specified in 4.6.
3.6.3 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 48 hours after application.
3.6.4 Viscosity and pot life. The viscosity of the admixed coating when maintained under
continuous mixing (no vortex) in a closed container, and tested as specified in 4.6 through a No.
4 Ford cup, shall be as specified in table II.
TABLE II. Viscosity.
Maximum time through a No. 4 Ford cup
Time from mix (minimum)
Initially
30 seconds
4 hours
60 seconds
5 hours
no gelation
3.7 Cured coating properties.
3.7.1 Drying time. When applied by spray techniques and tested as specified in 4.6, the
coating shall be set-to-touch within six hours and dry-hard within twelve hours.
3.7.2 Surface appearance. The coating shall dry to a uniform, smooth surface, free from
runs, sags, bubbles, streaks, hazing, seeding, dusting, floating, mottling, or other defects (see
4.6.3). No orange peel (wavy appearance) shall be evident when viewed from six feet away.
3.7.3 Color. The applied coating, prepared in accordance to 4.5 through 4.5.2 shall be
tested in accordance with ASTM D2244 using CIELAB color coordinates with a 10° observer
and D65 illuminant. The applied coating dry film shall have a color difference (E) of less than
1 when compared to the specified color chip in FED-STD-595.
3.7.4 Infrared reflectance (FED-STD-595, color number 34095 only). The total infrared
reflectance (specular and diffuse) of the coating (FED-STD-595, color number 34095), relative
to barium sulfate shall be not greater than 8 throughout the range of 700 to 2,600 nanometers
(nm) (see 4.6.4).
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