TT-P-1757B
volume, composed of the chemical compounds classified below, or which does not exceed any of the following individual percentage composition limitations, referred to the total volume of solvent, when tested in accordance with 4.6.1:
A combination of hydrocarbons, alcohols, aldehydes, esters, ethers, or ketones having an olefinic or cyclo-olefinic type of unsaturation except perchloroethylene: 5 percent.
A combination of aromatic compounds with eight of more carbon atoms to the molecule except ethylbenzene, methyl benzoate, and phenyl acetate: 8 percent.
A combination of ethylbenzene, ketones having branched hydrocarbon structures, trichloroethylene or toluene: 20 percent.
3.2.1.2 Type II. The VOC content of the type II primer coating shall be less than or equal to
340 g/l (2.8 lb./gal), when tested in accordance with ASTM-D3960 (see 4.6). Chlorinated and halogenated solvents are prohibited.
3.2.2 Thinner compatibility. The primer coating shall be compatible with thinner conforming to MIL-T-81772, type III.
3.2.3 Total solids. For non-pressurized packaged primer coatings, the total solids content shall be equal to or greater than 59 percent by weight, when tested in accordance with
ASTM-D2369 (see 4.6). For pressurized (aerosol) packaged primer coatings, the total solids content shall be equal to or greater than 13 percent by weight, when tested in accordance with ASTM-D2369 (see 4.6).
3.2.3.1 Pigment content. The pigment content of the primer coating shall be equal to or greater than 53 percent by weight of the total solids content, when tested in accordance with ASTM-D2698 (see 4.6). Siliceous extenders shall be less than or equal to 15 percent by weight of the total pigment content; however siliceous extenders containing more than 1.0 percent crystalline silica (such as crystobalite or tridymite) are prohibited.
3.2.3.1.1 Class C. The pigment portion of the class C primer coating shall contain zinc chromate equal to or greater than 85 percent by weight of the total pigment content, when tested in accordance with ASTM-D444 (see 4.6).
3.2.3.1.2 Class N. The pigment portion of the class N primer coating shall not contain chromium, when tested in accordance with ASTM-D3718 (see 4.6).
3.2.4 Nonvolatile vehicle (resin) content. The nonvolatile vehicle (resin) content shall consist of 81 to 84 percent by weight drying-type phthalic anhydride plus 16 to 19 percent by weight oil-modified phenol-aldehyde resin, when tested in accordance with ASTM-D563. Additionally, it shall be free of rosin and rosin-type derivatives, when tested in accordance with ASTM-D1542 (see 4.6 and table I).
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