MIL-PRF-3043C
4.7.2 Test panel sizes. The size and thickness of panels, in inches (ins.), for each test shall be as follows:
Test Panels
Test Size ins.
Thickness ins.
Spray application
6 X 12
0.014 - 0.030
Dip application
optional
Drying time
optional
Baking in oil
1.250 X 4
0.063 - 0.125
Oven baking
6 X 12
0.014 - 0.030
Bending flexibility
3X6
0.014 - 0.030
Abrasive flexibility
3X6
0.014 - 0.030
Humidity
2X4
0.063 - 0.125
High humidity (cold cycle)
2X4
0.063 - 0.125
Salt spray
3X6
0.014 - 0.030
Aromatic hydrocarbon
1.250 X 4
0.063 - 0.125
Salt water hydrocarbon
3X4
0.014 - 0.030
Cold cycle
2X4
0.063 - 0.125
Hot Oil
1.250 X 4
0.063 - 0.125
Removability
optional
Sandblast
optional
Carbon remover
3X6
0.014 - 0.030
Storage stability
6 X 12
0.014 - 0.030
4.7.3 Test panel preparation. All edges shall be rounded and a 0.250 inch hole shall be drilled on the
center line near one end for all panels except the 2 X 4 inch panels. Remove all edges, burrs, and corners
(including those at the edges of holes). The 1.250 X 4 inch and the 2 X 4 inch panels shall be surface
ground to a roughness of 10 to 16 micro-inches root mean square. The 3 X 6 inch and 4 X 12 inch panels
shall be smoothly finished with a 320 grit paper. All panels not used immediately shall be preserved in an
atmosphere having a relative humidity of 20 percent or less. Prior to use, the panels shall be thoroughly
cleaned and dried with lintless cloths. After drying, the panels shall be submerged in boiling 95 percent
methanol. Care should be taken during cleaning and preparation to avoid fingerprint contamination.
4.8 Performance requirement tests.
4.8.1 Coating application. All test panels except the spray application test panels shall be prepared by dip
coating in a temperature range of 65oF to 85oF and a relative humidity of 50 ±10 percent. The clean test
panels shall be withdrawn vertically at a rate so as to produce a dry film coating thickness of 0.5 to 0.7
mils for all tests except the flexibility test which shall be maintained with 0.2 to 0.3 mils. The 6 X 12 inch
panels shall be coated by spraying to a film thickness of 0.5 ±0.2 mil. These panels shall then be allowed
to air dry for not less than one hour at the above ambient conditions. All panels except the Baking in oil
and the Oven baking test panels shall be baked prior to test at 325oF ±5oF for 30 ±5 minutes (see 3.8.1).
4.8.2 Drying time tests.
4.8.2.1 Air dry test. Coated test panels air dried at room temperature at 75oF ±10oF for 30 minutes shall
be dry to the touch with no transfer of coating (see 3.8.2.1).
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