MIL-DTL-24607B
4.4 Test conditions. Unless otherwise specified (see 6.2), the routine and referee testing conditions shall be in
accordance with FED-STD-141. The term referee condition shall mean a temperature of 73±2 °F (23±1 °C) and a
relative humidity of 50±4 percent. A dry film thickness of 0.0015 to 0.002 inches (0.038 to 0.051 mm) shall be used
whenever film thickness is requested in any test, unless otherwise required by the test. All paint test specimens shall
be cured at least 16 hours at ambient laboratory conditions before testing unless otherwise specified (see 6.2).
4.4.1 Test panels and surface preparation. Unless otherwise specified (see 6.2), test panels shall be prepared as
a.
Two sets of panels shall be prepared and all tests conducted with a panel of each set.
b.
Panels shall be steel having nominal dimensions of 6 inches by 12 inches by 0.125 inch (150 mm by 300
mm by 3 mm). Panels shall be prepared for testing by abrasive blasting to a near white surface in
accordance with SSPC SP 10 to achieve a minimum 0.002 inch; 2.0 mil (0.050 mm) surface profile. The
blasted panels shall be solvent wiped to remove any traces of oil or residue, blown dry with dry air,
wrapped in plastic, and stored in either a desiccator or in other storage that will prevent rusting prior to
coating. The abrasive used for blasting shall be in accordance with MIL-A-22262 and be listed on the
current qualified products list (QPL).
c.
One set of panels shall be primed with primer provided in accordance with TT-P-645. The other set of
panels shall be primed with primer provided in accordance with MIL-DTL-24441/20 or
MIL-DTL-24441/29.
Unless otherwise specified (see 6.2), primed panels shall be dried (cured) for 1 week at normal laboratory
d.
conditions or overnight at 104 to 122 °F (40 to 50 °C) before being topcoated.
Unless otherwise specified (see 6.2), test coatings shall be applied in accordance with the manufacturers'
e.
f.
The enamel shall be applied to the primed panels in two coats at a wet film thickness that will yield a dry
film thickness of 0.002 to 0.003 inch (0.050 mm to 0.075 mm) per coat. Unless otherwise specified (see
g.
Where glass plates are specified for the test procedure, industry standard paper charts may be substituted
for the test.
4.5 Tests.
4.5.1 Soluble and total metal content. Soluble and total metal content, except tantalum and tungsten, shall be
determined on a dry paint film of the enamels in accordance with the 40 CFR 261, Appendix II and the appropriate
test listed in tables VII and VIII. Soluble metal content shall be reported as milligrams per liter (mg/L). Total metal
content shall be reported as percent by weight of the dry enamel film. The test results for metal shall be in
conformance with the requirements of 3.2.1 and tables II and III. Tantalum and tungsten soluble metal content and
total metal content shall be analyzed as specified in 4.5.1.1.
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