MIL-PRF-24635E
Two panels shall be coated with one coat of the same coating originally applied to the panel, at the
a.
manufacturer's recommended per-coat DFT listed on the ASTM F718 sheet. After this coat has dried
through as defined in ASTM D5895, a second coat of the product shall be applied to both panels, at the
manufacturer's recommended per-coat DFT. The panels shall be allowed to cure-to-service at referee
conditions in accordance with the manufacturer's ASTM F718 sheet. If the total system DFT is greater
than or equal to 15 mils, the overcoat adhesion of each panel shall be determined in accordance with
ASTM D3359, Method A. If the total system DFT is less than 15 mils, the overcoat adhesion of each panel
shall be determined in accordance with ASTM D3359, Method B. If the total DFT is between 5 to10 mils,
the spacing between the lines in the Method B cross-hatch shall be doubled. If the total DFT is between 10
to 15 mils, the Method B line spacing shall be tripled.
b.
Two panels shall be coated with one coat of MIL-DTL-24441/20 or MIL-DTL-24441/29, Type III or IV
formula 150 at a nominal WFT of 0.003 to 0.004 inch (0.076 to 0.101 mm). After the panels have cured at
referee conditions for 7 days, both panels shall be overcoated with the coating being tested, applied at the
manufacturer's recommended per-coat DFT listed on the ASTM F718 sheet. The panels shall be allowed
to cure-to-service at referee conditions in accordance with the manufacturer's ASTM F718 sheet. The
overcoat adhesion of each panel shall be determined in accordance with ASTM D3359, Method B. If the
total DFT is between 5-10 mils, the spacing between the lines in the Method B cross-hatch shall be
doubled. If the total DFT is between 10 to15 mils, the Method B line spacing shall be tripled.
c.
Two panels shall be coated with one coat of anti-corrosive primer qualified to MIL-PRF-24647 at a
nominal WFT of 0.003 to 0.004 inch (0.076 to 0.101 mm). After the panels have cured at referee
conditions for 7 days, both panels shall be overcoated with the coating being tested, applied at the
manufacturer's recommended per-coat DFT listed on the ASTM F718 sheet. The panels shall be allowed
to cure-to-service at referee conditions in accordance with the manufacturer's ASTM F718 sheet. The
overcoat adhesion of each panel shall be determined in accordance with ASTM D3359, Method B. If the
total DFT is between 5 to 10 mils, the spacing between the lines in the Method B cross-hatch shall be
doubled. If the total DFT is between 10 to15 mils, the Method B line spacing shall be tripled.
d.
Two panels shall be coated with one coat of TT-P-645 Navy formula 84 at a nominal WFT of 0.003 to
0.004 inch (0.076 to 0.101 mm). After the panels have cured at referee conditions for 7 days, both panels
shall be overcoated with the coating being tested, applied at the manufacturer's recommended per-coat
DFT listed on the ASTM F718 sheet. The panels shall be allowed to cure-to-service at referee conditions
in accordance with the manufacturer's ASTM F718 sheet. The overcoat adhesion of each panel shall be
determined in accordance with ASTM D3359, Method B. If the total DFT is between 5 to 10 mils, the
spacing between the lines in the Method B cross-hatch shall be doubled. If the total DFT is between 10 to
15 mils, the Method B line spacing shall be tripled.
e.
Two panels shall be coated with one coat of the primer for any system qualified to MIL-PRF-23236,
Type VII, in accordance with the manufacturer's ASTM F718 for the primer selected. After the panels
have cured at referee conditions for 7 days, both panels shall be overcoated with the coating being tested,
applied at the manufacturer's recommended per-coat DFT listed on the ASTM F718 sheet. The panels
shall be allowed to cure-to-service at referee conditions in accordance with the manufacturer's ASTM F718
sheet. The overcoat adhesion of each panel shall be determined in accordance with ASTM D3359, Method
B. If the total DFT is between 5 to10 mils, the spacing between the lines in the Method B cross-hatch shall
be doubled. If the total DFT is between 10 to15 mils, the Method B line spacing shall be tripled.
4.5.21 Flexibility. Coating film flexibility shall be determined in accordance with ASTM D522. The test panel
shall be a flat metal plate of approximately 31 gauge. The panel shall be primed with either the primer specified by
the manufacturer as part of the coating system, or a primer in accordance with MIL-DTL-24441. The coating being
tested shall then be applied to the primed panel, allowed to air-dry for 2 hours, and then baked for 24 hours at 212 to
221 °F (100 to 105 °C). The panel shall then be removed from the oven and allowed to stand for 30 minutes at
laboratory temperature [nominal 73 °F (23 °C)]. The panel shall then be bent over a ¼-inch (6 mm) mandrel or a
tapered mandrel where the minimum diameter is ¼-inch (6 mm) and the film examined at the bent under a
magnification of 5 diameters.
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