MIL-DTL-450D
3. REQUIREMENTS
3.1 First article. When specified (see 6.2), a sample (see 6.3) shall be subjected to first
article inspection in accordance with 4.2.
3.2 Color. The color shall be black at a dry film thickness producing complete hiding and
varying shades of brown in thinner film as verified by visual inspection.
3.3 Composition. The coating compound shall consist of one or more grades of natural or
petroleum asphalts in a solvent and shall contain no drying oils, resins, or pigments.
3.3.1 Solvent.
3.3.1.1 Composition G. The solvent used in the formulation of the coating compound shall
be a low boiling, fast evaporating aliphatic naphtha, TT-N-95.
3.3.1.2 Composition L. The solvent used in the formulation of the coating compound shall
be the same as 3.3.1.1, except that it shall conform to the requirements of Table I when tested as
specified in 4.4.19.
Table I. Composition L solvent requirements.
Maximum allowable percent by
Material1
volume
(a) Solvents (hydrocarbons, alcohols, etc.) having an olefinic or
Negative test (less than 1%)
cycloolefinic type of unsaturation
(b) A combination of any aromatic hydrocarbons having eight
8
or more carbon atoms per molecule (except ethylbenzene)
(c) Ethylbenzene and toluene
20
(d) Total (b) and (c) above
20
1
The test (a) for olefinic and cycloolefinic compounds will be negative for solvents containing less than 1% of these compounds.
3.4 Quantitative requirements. When tested as specified in 4.4, the coating compound
shall conform to the quantitative requirements of Table II.
4
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