MIL-PRF-26915D
4.9.1 Hazardous materials verification. The MSDS shall certify that the primer contains no EPA
Class I Ozone Depleting Substances, hazardous materials IAW FED-STD-313, or any known
carcinogens (see 3.5.1).
4.9.2 Odor test. The primer shall be tested for characteristic, residual, and obnoxious odor of the
wet and dry primer film relative to the solvent and diluents used IAW ASTM D 1296 (see 3.5.2).
4.9.3 Water resistance test. A primer-coated test panel shall be half-immersed in distilled water
at 100°F for 48 hours. A primer plus enamel-coated and primer plus polyurethane-coated panel
shall be half-immersed in distilled water at 100°F for 24 hours. Upon removal from immersion,
the primer and topcoat films shall show no signs of wrinkling, blistering, loss of adhesion, or other
visible defects. Slight softening may be disregarded. Twenty-four hours after removal, the
immersed portion of the films shall be equal in hardness and color to the unimmersed portion of
the panel (see 3.5.3).
4.9.4 Hydrocarbon resistance test. A primer-coated, and primer plus topcoated test panels shall
be half-immersed in TT-S-735, Type III at 75°F for 24 hours. Upon removal from immersion, the
primer and topcoat films shall show no signs of wrinkling, blistering, loss of adhesion, or other
visible defects. Slight softening may be disregarded. Twenty-four hours after removal from the
hydrocarbon, the immersed portion of the film shall be equal in hardness and color to the
nonimmersed portion (see 3.5.4).
4.9.5 Synthetic fluid resistance test. A primer-coated panel shall be half-immersed in a synthetic
aircraft turbine engine lubricating oil (ester based) at 160°F for 168 hours. Upon removal from
immersion, the primer shall show no signs of wrinkling, blistering, loss of adhesion, or other
visible defects. Slight softening or staining may be disregarded (see 3.5.5).
4.9.6 Humidity resistance test. Panels prepared by each of the four cleaning methods specified in
4.6.2 shall be coated with primer, primer plus enamel, and primer plus polyurethane. The panels
shall be exposed in a humidity cabinet for 168 hours IAW ASTM D 1748 at 120° ± 2°F and
100% humidity. Upon test completion, the film shall show no signs of blistering, wrinkling, or
loss of adhesion (see 3.5.6).
4.9.7 Salt spray resistance test. Panels shall be prepared, cleaned, and coated with the primer,
primer plus enamel, and primer plus polyurethane. The panels shall be exposed to salt spray for
336 hours IAW FED-STD-141, Method 6061 except that they shall not be scored (see 3.5.7).
4.9.8 Heat resistance test. Panels shall be solvent-cleaned and coated with primer. These panels
shall be exposed to 350° ± 5°F for 24 hours in a heating chamber. The panels shall be removed
and conditioned to room temperature. The panels shall then be tested for flexibility IAW 4.8.5
and humidity resistance IAW 4.9.6 (see 3.5.8).
4.9.9 Inhibitive properties test. Panels shall be prepared, cleaned, coated, cured, and exposed for
21 days IAW 4.9.8 except that they shall be scored. Upon completion of the test, the panels shall
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