MIL-PRF-81352C
3.5.1 Condition in container. The coatings shall exhibit no grit, skinning, curdling, livering
or excessive pigment flotation. The coatings shall show no more pigment settling or caking than
can be easily and completely reincorporated to a smooth homogenous state by mixing with a
hand paddle. In addition, the containers shall exhibit no deformity (see 4.6.10).
3.5.2 Coarse particle content. The particles retained on a No. 325 sieve shall be not greater
than 0.1 percent by total weight of the coating, when tested in accordance with ASTM-D185
(see 4.6).
3.5.3 Fineness of grind. The fineness of grind of the coatings shall be not less than 7.0 for
gloss colors and not less than 5.0 for all other colors when tested in accordance with
ASTM-D1210 (see 4.6).
3.5.4 Viscosity. The viscosity of the coatings, as prepared for application in accordance
with the manufacturer's instructions, shall be 16 to 25 seconds through a #4 Ford cup when
tested in accordance with ASTM-D1200 (see 4.6).
3.6 Working properties. The coatings shall yield a smooth and uniform film when applied
by spray, brush, or roller and shall conform to 3.6.1 through 3.6.4.
3.6.1 Odor. The odor of the coatings shall be characteristic of the solvents used when tested
in accordance with ASTM-D1296 (see 4.6). The air-dried coatings shall retain no residual odor
48 hours after application.
3.6.2 Drying time. The coatings, when applied to a wet film thickness of 1.7 to 2.3 mils
[43 to 58 microns (µm)], shall dry tack-free within 60 minutes, when tested in accordance with
ASTM-D1640 (see 4.6).
3.6.3 Surface appearance. The coatings shall dry to a smooth, uniform film, free of runs,
sags, bubbling, wrinkling, streaking, blushing, haze, blisters, coarse particles, or other surface
irregularity when prepared and examined in accordance to 4.6.2 (see 4.6).
3.6.4 Coating system compatibility. All coatings supplied under this specification shall be
compatible with the coatings listed in MIL-STD-7179, table I.
3.7 Film properties.
3.7.1 Color. When tested in accordance with ASTM-D1729 (see 4.6), the color of the
coatings shall be a visual match with the specified FED-STD-595 color chip (see 6.2).
3.7.2 Specular gloss. The applied coatings shall conform to table I when tested at a 60°
geometry in accordance with ASTM-D523 (see 4.6).
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