MIL-DTL-450D
4.4.16.2 Reagents.
a. Picric acid
b. Sulfuric acid
c. Nitric acid
d. Hydrochloric acid
4.4.16.3 Method.
a. Prepare four steel panels as in 4.4.15.
b. Apply saturated picric acid, sulfuric acid (specific gravity, 1.30), nitric acid (specific
gravity, 1.22), and hydrochloric acid (specific gravity, 1.09) to the panels as in ASTM D 1308.
c. Place 3 or 4 drops of each acid on the test coating on separate panels and cover with a
watch glass approximately 1.5 inches in diameter. The watch glass shall be at least ¼ inch from
the coating edge.
d. At the end of six hours, rinse the acid from the panel and inspect for compliance with
3.5.6.
e. Remove the coating compound from the panel, and check for etching of the metal.
4.4.17 Heat resistance.
4.4.17.1 Equipment.
a. 3-inch by 5-inch steel panel
b. Oven
4.4.17.2 Reagents.
a. Naphtha
4.4.17.3 Method.
a. Mask off half of a 3-inch by 5-inch steel panel, and spray the coating compound on the
uncovered portion to a dry film thickness between 0.0009 and 0.0011 inch. Type II and Type III
compounds should be thinned with low boiling, fast evaporating naphtha to a suitable spraying
viscosity.
b. Air dry for 24 hours at 23 ± 1 ºC.
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