MIL-PRF-14105E
4.17 Viscosity, Krebs-Stormer. Determine viscosity in accordance with ASTM D562. Check for
compliance with table I.
4.18 Suspension properties. Reduce the paint to spraying consistency according to the supplier's
instructions. Place six (6) ounces of the reduced paint in an eight (8) ounce glass jar and do not
agitate or disturb for twenty four (24) hours. At the end of this period, examine the paint for hard
or excessive settlings by means of a spatula. Restopper the jar and shake vigorously for twenty
(20) seconds. Reexamine the paint for any evidence of nonhomogeneity or undispersed pigment.
Nonconformance to 3.6.4 shall constitute failure of this test.
4.19 Specular gloss (60 degree). Prepare a film of the paint on steel as specified in 4.7 and allow
to dry twenty four (24) hours at room temperature. Determine the 60 degree specular gloss in
accordance with ASTM D523. Nonconformance to table I shall constitute failure of this test.
4.20 Drying properties.
4.20.1 Air drying. Determine the air drying properties of the paint in accordance with ASTM
D5895 by spraying or brushing a coat of the paint to a dry film thickness of not greater than 2.5
mils (63.5 microns) on test panels prepared as specified in 4.7. Air dry the panels in a vertical
position for one (1) hour. Nonconformance to 3.6.5.1 shall constitute failure of this test.
4.20.2 Baking. Bake a coated test panel prepared as specified in 4.7 in a well-ventilated
laboratory oven at 400 ºF (204 ºC) for one (1) hour. Allow to cool to room temperature, and
examine in accordance with ASTM D5895. Nonconformance to 3.6.5.2 shall constitute failure of
this test.
4.21 Water resistance. Prepare a coated test panel, 3 inches (76.2 mm) x 6 inches (152.4 mm) in
accordance with 4.7 and air dry for one hundred sixty eight (168) hours. Coat all exposed uncoated
metal surfaces with wax or other suitable protective coating and immerse the test panel to a depth of
3 inches (76.2 mm) for eighteen (18) hours in distilled water at 77 ± 9 ºF (25 ± 5 °C). At the end of
the immersion time, remove the panel from the distilled water and examine the paint film.
Nonconformance to 3.6.6 shall constitute failure of this test. Disregard any change in color.
4.22 JP8 resistance. Prepare a coated test panel in accordance with 4.7. Air dry for one (1) hour,
then bake in a well-ventilated laboratory oven at 400 ºF (204 ºC) for one (1) hour. Allow to cool
to room temperature. Unpainted surfaces shall not be coated with wax or other material. Immerse
the coated test panel to a depth of 3 inches (76.2 mm) for eighteen (18) hours in JP8. Remove the
test panel and immediately examine the paint film for wrinkles or blisters. Air dry the test panel
for two (2) hours and reexamine the film for defects. Nonconformance to 3.6.7 shall constitute
failure of this test.
4.23 Salt spray resistance. Prepare a coated steel test panel in accordance with 4.7 and air dry for
one hundred sixty eight (168) hours. Coat the exposed unpainted areas of the panel with a
protective material. Make an "X" scribe to the base metal with each of the four (4) legs of the
scribe being at least 2 inches long and at least 0.5 inch from any test panel edge. Expose to salt
spray for one hundred (100) hours in accordance with ASTM B117, using five (5) percent salt
solution and examine. Nonconformance to 3.6.8 shall constitute failure of this test.
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