MIL-DTL-24607B
4.5.5 Volatile organic compounds (VOC). VOC content shall be determined in accordance with 40 CFR 60,
Appendix A, Method 24. VOC content shall be as specified in table V (see 3.6.3).
4.5.6 Brushing properties. Brushing properties of the packaged enamel shall be determined in accordance with
Method 4321.3 of FED-STD-141 for compliance with 3.6.4.
4.5.7 Recoating properties. Three panels shall be primed as specified in 4.4.1 with each primer. The first panel
of each set shall have a 0.002- to 0.003-inch; 2- to 3-mil (0.051- to 0.076-mm) coating (topcoat) of paint applied,
manufactured to MIL-PRF-24596. The second panel of each set shall have a 0.002- to 0.003-inch; 2- to 3-mil
(0.051- to 0.076-mm) topcoat of Navy formula 25A, White applied. The third panel of each set shall have a
0.002- to 0.003-inch; 2- to 3-mil (0.051- to 0.076-mm) topcoat of the MIL-DTL-24607 test enamel applied that has
been produced to this specification. After drying (curing the three panels for 48 hours at 122 °F (50 °C), the panels
shall be cooled to ambient laboratory conditions and a 0.002- to 0.003-inch; 2- to 3-mil (0.051- to 0.076-mm)
topcoat applied of the MIL-DTL-24607 test enamel. The enamel shall be examined for blistering, wrinkling, or
peeling. The adhesion shall be checked by Method 6304.1 of FED-STD-141 except that the knife used may be an
ordinary pocketknife or utility knife. Enamel condition shall be as specified in 3.6.10.
4.5.8 Spraying properties. The enamel shall be sprayed on a steel panel to a dry film thickness of 0.0009 to
0.0011 inch (0.023 to 0.028 mm). The panel shall be observed for spraying properties in accordance with Method
4331.2 of FED-STD-141 to determine compliance with 3.6.6.
4.5.9 Flexibility. Flexibility shall be determined in accordance with ASTM D522. The enamel shall be applied
to a flat metal plate of approximately 31 gauge coated with a dry film thickness of 0.001 inch + 0.0003 inch (0.025
mm) of TT-P-645 primer by means of a doctor blade capable of yielding a dry film thickness of 0.001 inch + 0.0003
inch (0.025 mm). The panel shall be allowed to air-dry for 2 hours 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 -inch (3.2-mm) mandrel or a tapered
mandrel where the minimum diameter is inch (3.2 mm) and the film examined at the bent under a magnification
of 5 diameters. Flexibility shall be as specified in 3.6.9.
4.5.10 60-degree specular gloss. The thoroughly mixed enamel on plane, opaque, black glass panels shall be as
specified in ASTM D823. A film applicator shall be used that will produce a wet film thickness of 0.003 inch
(0.075 mm). The enamel shall be dried 24 hours under referee conditions in a dust-free environment. Paint
specimen shall be dry hard before gloss test. A longer cure time shall be used if required. When tested as specified
4.5.11 Non-flaming property. The non-flaming property of the test enamel shall be determined in accordance
with ASTM E162. Test enamel shall be applied to three -inch thick cold rolled steel panels abrasive blasted to
4.5.12 Resistance to ignition. The resistance to ignition test shall be conducted in accordance with Appendix
A. Test results shall be in accordance with the requirements of 3.6.13.
4.6 Pigment content. The pigment content test shall be conducted in accordance with test method prescribed by
4.7 Volatile percent. The volatile percent test shall be conducted in accordance with test method prescribed by
4.8 Density. The density test shall be conducted in accordance with test method prescribed by table VI. Test
results shall be in accordance with the requirements of table V.
4.9 Appearance. The appearance test shall be conducted in accordance with test method prescribed by table
4.10 Sag resistance. The sag resistance test shall be conducted in accordance with test method prescribed by
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