MIL-DTL-450D
4.4.15 Water resistance.
4.4.15.1 Equipment.
a. 3-inch by 5-inch steel panel
b. Film applicator
4.4.15.2 Reagents.
a. Naptha
b. Ethylene glycol monoethyl ether
c. Wax
d. Distilled water
4.4.15.3 Method.
a. Prepare one 3-inch by 5-inch steel panel in accordance with Procedure C or D of
ASTM D 609. The steel shall be of Types 1 or 2 steel conforming to ASTM D 609. The
cleaning solvent shall be a mixture of three volumes of naphtha and one volume of ethylene
glycol monoethyl ether.
b. Using a film applicator that will deposit a dry film thickness between 0.0009 and
0.0011 inch, draw down a 2-inch-wide film of the coating compound on the clean steel panel.
c. Air dry for 24 hours at 23 ± 1 șC.
d. Coat all exposed metal surfaces with wax or other suitable coating, and immerse for
18 hours in distilled water at 23 ± 1 șC in accordance with ASTM D 1308.
e. At the end of the test period, remove the panel and inspect for compliance with 3.5.5.
4.4.16 Acid resistance.
4.4.16.1 Equipment.
a. Steel panels (see 4.4.15)
b. Watch glass
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