MIL-PRF-63460E
4.4.3.3 Examination of test panels after combustion. After a period of 96 hours remove the
test panels from the chamber, wipe the panels lightly with a soft cloth or tissue paper soaked with
petroleum ether and measure any rust spots on the test face of the panels for compliance with the
requirements of 3.4.3. Rust spots occurring within 3 mm of the edges of the test panel shall not
be cause for failure.
4.4.4 Water displacement and water stability. Conduct the water displacement and water
stability test in accordance with method 3007 of FED-STD-791, except that the test shall be
made only on the compound-water mixture.
4.5 Operating requirements verifications.
4.5.1 Firing residue removal. Weigh 5.0 ± 0.5 grams of WC 844 propellant powder into a
clean porcelain evaporating dish (round bottom type) of approximately 102mm in diameter and
spread it around evenly with a small brush. Ignite the propellant with a Bunsen burner and burn
until all visible propellant is consumed. Allow dish to cool for 20 minutes.
4.5.1.1 Dish preparation. Invert the dish, rap it sharply several times against the table top and
then blow it out with a 15 psi stream of filtered air, to remove any non-adhering residue. The
dish shall be held approximately 15 cm from the end of the air hose. Weigh the dish with the
adhering residue, and subtract the weight of the evaporating dish (empty) to determine the
weight of propellant residue adhering to the dish (W1).
4.5.1.2 Cleaning process. Add 25 ± 1 ml of the CLP product and permit it to soak for 45 ± 3
min, at 54 ± 1 °C (129 ± 2 °F) in convection oven. Remove the dish and immediately swab the
residue with a cotton muslin cleaning pad wrapped around the wide end of a Coors # 60323
porcelain pestle, weighing approximately 470 grams and measuring approximately 190 mm high
by 57 mm at its widest point. Swab the dish in both a circular and back and forth motion for a
period of 90 seconds, letting the weight of the pestle perform the actual removal of the residue.
Do not apply any downward force to the pestle.
4.5.1.3 Calculation of residue removed. After swabbing, decant the remaining oil and
thoroughly wash the inside of the dish with 75 ml of petroleum ether in accordance with O-E-
751. Heat the evaporating dish to 55 ± 1° C (131 ± 2 °F) for 30 ± 2 minutes, cool to room
temperature and weigh the dish with the remaining residue. Subtract the weight of the
evaporating dish (empty) to determine the weight of propellant residue still adhering to the dish
after the cleaning cycle (W2). Calculate the percent residue removed by the equation:
W1 W2
% residue removed = 100 x
W1
4.5.1.4 Firing residue removal failure criteria. This test is run three times. If the average
residue removal of the three test iterations is less than eighty percent (80 %), the product shall
fail to qualify.
4.5.2 Weapon performance. The performance of the candidate CLP product in cold
temperatures, after exposure to blowing dust, and after salt water immersion shall be tested by
live-fire weapons tests in accordance with TOP 3-2-045, except as noted herein. The test
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