MIL-DTL-450D
3.5.6 Acid resistance. A film of coating compound prepared and tested as specified in
4.4.16 shall withstand the action of picric, sulfuric, nitric, and hydrochloric acids without
disintegration, browning, or dulling. There shall be no etching of the metal underneath the
coating compound.
3.5.7 Heat resistance. A film of coating compound prepared and tested as specified in
4.4.17 shall not sag or flow.
3.5.8 Flexibility. A film of coating compound prepared and tested as specified in 4.4.18
shall be tough, elastic, and shall withstand bending without cracking or flaking.
3.6 First article only requirements.
3.6.1 Reactivity. When subjected to the vacuum stability test as specified in 4.4.20, the
reactivity of the compound with the following explosives shall not exceed 2.0 milliliters (mL) of
gas over and above that generated by the controls:
a. Composition A-3
b. Composition B-type explosive (1)
Either Composition B-4, Composition B, or Cyclotol
c. Composition C-4
d. Octol
e. TNT or Tritonal (1)
f. HBX-type explosive (1)
Either HBX-1, HBX-3, or H-6
3.6.2 Ignition. When tested as specified in 4.4.21, mixtures of the dried compound and the
explosives listed in Table III shall give ignition temperatures for consecutive tests at or above
those shown.
Table III. Ignition temperature.
Explosives
Minimum
Composition B
175 ºC
TNT
200 ºC
Composition A-3
190 ºC
3.7 Workmanship. The asphaltic compound ingredients shall be processed in a manner that
will produce the high quality material necessary to meet the requirements of this specification.
The finished product shall be homogeneous and free from a foam-like texture on its surface or
other defects that could adversely affect its intended use.
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