MIL-PRF-85285E
15 G.U. at 60°. (c) The camouflage colors shall have a change in G.U. of less than 3 at 60° and
85° from the unexposed initial values, and (d) the coating color difference (ΔE) shall have a
value of less than 1.0 when compared to an unexposed sample of the same batch using CIELAB
color coordinates.
3.8.3 Humidity resistance. The coating shall withstand exposure for no less than 30 days in
a humidity cabinet maintained at 49 ±2 °C (120 ±3 °F) and 100 percent relative humidity (RH)
without blistering, softening, exhibiting any loss of adhesion, nor other film defects when tested
as specified in 4.6.
3.8.4 Heat resistance (color change). The coating after exposure shall have a color
difference (E) less than or equal to 1.0 when compared to an unexposed sample of the same
batch and tested as specified in 4.6.10 using CIELAB color coordinates.
3.8.5 Solvent resistance (cure). The coating shall withstand 25 double rubs with a cotton
terrycloth rag soaked in methyl ethyl ketone (MEK) solvent (see 6.10) when tested in accordance
with 4.6.11. Rubbing through to bare metal indicates failure of the coating due to improper cure.
3.8.6 Tape resistance. The coating shall not exhibit permanent marring caused by masking
tape applied to the coated test panels, when tested in accordance with 4.6.12.
3.9 Working properties.
3.9.1 Mixing. The components of the coating, including thinner if applicable (see 3.5.1.3),
shall homogeneously blend when mixed by a paint shaker in the volume mixing ratio specified
by the manufacturer. Within one hour of mixing, the admixed coating shall not separate into
visually distinct layers or exhibit foaming that persists one hour or more after mixing.
3.9.2 Application. The coating shall be applied by conventional, airless, HVLP (High
Volume Low Pressure), or electrostatic (class H only) spray application. When spray is applied
at 15.6 to 32.2 °C (60 to 90°F) and a relative humidity of 20 to 80 percent, the coating material
shall yield a smooth, uniform film at a dry-film thickness of 1.7 to 2.3 mil. No orange peel
(wavy appearance) shall be evident when viewed from six feet away. When reducing the
coating, caution shall be taken not to exceed the maximum VOC content of 420 g/l for types I
and IV, 340 g/l for type II, and 50 g/l for type III.
3.9.3 Cleanability. The coating shall maintain a cleaning efficiency of not less than 75
percent for semi-gloss and camouflage colors and 90 percent for gloss colors, when cleaned in
accordance with 4.6.13 through 4.6.13.5.
3.9.4 Strippability. Coatings shall be tested in accordance with Methods A and B of 4.6.14,
and a minimum of 90 percent of the coating shall be stripped by one of the methods.
3.10 Identification of material. Individual containers greater than 1 pint and cases of
containers 1 pint or less, shall bear permanent labels showing the information contained herein.
Approved modified coatings shall be clearly identified on the label ( 6.5.3.1).
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