MIL-PRF-23377K
3.6 Physical properties - admixed components.
3.6.1 Color.
3.6.1.1 Type I. The color of the admixed type I primer coatings shall be the natural color of
the corrosion inhibiting pigments used. Tinting to a different shade is permitted.
3.6.1.2 Type II. The color of the admixed type II primer coatings shall be dark green,
black, or gray.
3.6.2 Odor. The odor of the admixed coatings, wet or dry, shall be characteristic of the
solvents used (see 4.5).
3.6.3 Viscosity. Immediately after mixing components A and B, the maximum viscosity of
the unthinned, admixed primer coatings shall be 40 seconds through a #4 Ford cup (see 4.5).
3.6.4 Pot life. After mixing and storage at room temperature in a closed container (see 4.5)
for 4 hours, the maximum viscosity of the unthinned primer coatings (see 3.6.3) shall be 70
seconds through a #4 Ford cup (see 4.5).
3.7 Physical properties - film.
3.7.1 Surface appearance. The admixed primer coatings, applied to a vertical surface, shall
not sag, run, or streak. The dried film shall have a smooth, uniform surface free of grit, seeds,
craters, blisters, and other irregularities (see 4.4.1). No orange peel (wavy appearance) shall be
evident when viewed from six feet away.
3.7.2 Drying time. The admixed primer coatings shall be tack free within 5 hours and shall
dry hard within 8 hours (see table II).
3.7.3 Lifting. There shall be no evidence of lifting or any other film irregularity after
topcoating the admixed primer coatings that have air dried for 5 hours (see 4.5.3).
3.7.4 Adhesion. There shall be no peeling or delamination between the primer and topcoat
or at the primer and substrate interface. The coatings shall have a rating of no less than a 4A
when examined in accordance with ASTM D3359 (see 4.5.4).
3.7.5 Flexibility. The primer coatings shall exhibit an elongation of not less than 10 percent
when tested in accordance with 4.5.5.
3.7.6 Infrared reflectance (type II primer coatings only). The total reflectance (specular and
diffuse) of the type II primer coatings, relative to barium sulfate, shall be not greater than ten
percent throughout the range of 700 to 2,600 nanometers (nm) (see 4.5.6).
3.8 Resistance properties.
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