MIL-PRF-3043C
3.8 Coating requirements.
3.8.1 Application. The material shall be capable of being applied to metallic surfaces by dip or spray at
room temperature. Room temperature shall be defined as the temperature range of 65oF to 85oF and a
relative humidity of 50 ±10 percent (see 4.8.1).
3.8.2 Drying time.
3.8.2.1 Air dry. Maximum time for the coating to dry to the touch at room temperature shall not exceed
30 minutes (see 4.8.2.1).
3.8.2.2 Oil bake. The coating air dried at room temperature 16 to 24 hours shall bake hard and tough and
be free of bubbles, pinholes, or other film irregularities when immersed in hot lubricating oil (see 4.8.2.2).
3.8.2.3 Oven bake. The coating shall bake hard and tough and be free of bubbles, pinholes, or other film
irregularities after baking. Test panels prepared for test of spray application, especially shall be examined
for these defects. A slight orange peel effect on these panels is acceptable (see 4.8.2.3).
3.9 Flexibility requirements.
3.9.1 Bending flexibility. The coating on a finished panel, shall show satisfactory anchorage at the bend
when rapidly bent over a 0.250 inch rod. It shall show no tendency to chip off in large pieces or peel when
scratched or scored with a sharp knife. Slight cracking at the bend will be permitted (see 4.9.1).
3.9.2 Abrasive flexibility. The film on a specimen shall show no sign of chipping or peeling when
subjected to sandblasting. However, wearing away of the film by abrasion will be permitted (see 4.9.2).
3.10 Environmental requirements.
3.10.1 Humidity resistance. The film shall show no evidence of corrosion or spread of corrosion beyond
that in the scratches cut in the finish. Additionally, the film shall show no softening, peeling, blistering,
chipping, or loss of adhesion (see 4.10.1).
3.10.2 High humidity (cold cycle). The film shall show no sign of corrosion beyond that in the scratches
cut in the finish. Additionally, the film shall show no softening, peeling, blistering, chipping, or loss of
adhesion (see 4.10.2).
3.10.3 Salt spray resistance. The film shall show no evidence of corrosion or spread of corrosion beyond
that in the scratches cut in the finish. Additionally, the film shall show no evidence of softening, peeling,
blistering, chipping, or loss of adhesion (see 4.10.3).
3.10.4 Aromatic hydrocarbon resistance. The film shall show no evidence of failure. The change in
weight shall not exceed 0.002 gram (see 4.10.4).
3.10.5 Salt water hydrocarbon resistance. The film shall show no evidence of softening, blistering,
leaching, or loss of adhesion. There shall be no evidence of corrosion on the metal (see 4.10.5).
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