MIL-PRF-63460E
bristle tooth brush into the CLP container and using a dull knife blade brushed across the bristles,
spatter fine droplets of the product onto a 50 mm square of each type detector paper. The paper
shall be observed for color change after 5 minutes. The CLP shall be considered unacceptable if
the fine droplets cause discoloration of the detector paper. Pink, orange, red-brown, yellow,
green and blue are examples of unacceptable colors for the M8 paper and any shade of red,
including pink, red-brown, red-purple, are unacceptable for the M9 paper.
4.4 Environmental verifications.
4.4.1 Humidity resistance. Three test panels shall be used to evaluate CLP for corrosion
protection in high humidity in accordance with method 5329 of FED-STD-791. Visually
examine the test panels after exposure for compliance with requirements of 3.4.1. Corrosion
on the outer 6.4mm of the panels shall not be cause for rejection.
4.4.2 Salt-spray resistance. Prepare three test panels in accordance with FED-STD-791,
Method 5329, except that, in place of the silica sand detailed in the materials section, 120 grit
white aluminum oxide shall be used. Evaluation of CLP for salt-spray resistance (5 % solution)
shall be in accordance with method 4001 of FED-STD-791, except that the panels shall be placed
at an angle of 10-20 ° during exposure to salt-spray within the cabinet. Visually examine the test
panels after exposure for compliance with requirements of 3.4.2. Corrosion on the outer 6.4 mm
of the panels shall not be cause for rejection.
4.4.3 Corrosion-protection from propellant reaction products. Humidity cabinet corrosion
test panels (ASTM D1748 Annex, A1.10 Steel Panels) shall be used. Thoroughly clean three
panels first in heated petroleum naphtha in accordance with TT-N-95 and then in heated
methanol in accordance with O-M-232. Solvents shall be heated sufficiently so that the solvent
will evaporate from the panels immediately upon withdrawal from the solvent baths.
4.4.3.1 Exposure of test panels to candidate CLP. Place the panels in a desiccator and after
they have cooled, slosh each panel in a beaker of the test oil for a period of one minute, then
suspend them from a rack and allow them to drain for a period of two hours. After the two hour
period slosh each panel for one minute in a beaker containing a solution of 5 % sodium chloride
by weight dissolved in distilled water. Drain the panels again for a period of fifteen minutes.
4.4.3.2 Exposure of test panels to propellant combustion. While the panels are draining,
weigh out 3 ± 0.1 gram of WC 844 propellant powder into each of three shallow-form porcelain
evaporating dishes measuring 120 mm in diameter with 195 ml capacity, such as a Coors
#60234. Concentrate the powder into a strip measuring approximately 25 mm wide across the
bottom of the dish. After completion of the 15 minute drain period, place a panel across the top
of a test fixture constructed of four humidity cabinet test panels fastened together to form a box-
like structure opened at top and bottom with the interior dimensions measuring 10.2 cm in
length, 4.45 cm in width, and 5.1 cm in height. Place the fixture with the test panel unit across
the rim of the evaporating dish centered over and parallel to the strip of propellant and ignite the
powder so that one face of the test panel is exposed to the burning propellant. Repeat this
operation on the other two panels and then suspend the three panels in an environmental chamber
maintained at 49 ± 2 °C (120 ± 4 °F) and 100 % relative humidity.
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