MIL-DTL-24441D(SH)
4.5.9 Spraying properties. Prepare the paint as specified in 4.5.1. Without further reduction, spray on a
sandblasted steel panel to a 150-µm (6-mil) (nominal) wet film thickness. Observe for spraying properties in
accordance with Method 4331.2 of FED-STD-141. Spraying properties shall be as specified in 3.6.2. For referee
test, use automatic application of Method 2131.2 of FED-STD-141.
4.5.10 Flexibility. Determine flexibility in accordance with ASTM D522 (Method A) and as follows:
4.5.10.1 Panel preparation. To a flat cold rolled steel strip (22-gage) panel, apply a 50-millimeter (2-inch)
(nominal) wide film of mixed paint (see 4.5.1) with a suitable film applicator that will give a dry film thickness of
38±8 µms (1.5±0.3 mils). Air-dry paint in a horizontal position for 24 hours at ambient laboratory conditions.
4.5.10.2 Procedure. Bend the panel 180 degrees over the graduated mandrel, and in the 3-millimeter area
examine the coating for cracks over the area of the bend in a strong light at a 2-diameter magnification. Flexibility
shall be as specified in 3.6.3.
4.5.11 Solvent resistance. Determine solvent resistance by immersion in xylene, methyl isobutyl ketone
(MIBK), and a 1:1 by volume mixture of methyl isobutyl ketone and xylene.
4.5.11.1 Panel preparation. Prepare three tin panels by cleaning with a 50:50 mixture of petroleum naphtha and
2-ethoxy ethanol. Draw down a film of mixed paint (see 4.5.1) to give a dry film thickness of 38±8 µms (1.5±0.3
mils). Air-dry the film at 23±3 °C (73±5 °F) for 24 hours.
4.5.11.2 Procedure. Immerse a panel in each solvent system listed in 4.5.11 at 23±3 °C (73±5 °F) for 18 hours
in accordance with ASTM D1308. Examine for wrinkling, softening, tackiness, swelling, blistering, loss of
adhesion, or other signs of solvent attack at removal, 2 hours and at 24 hours after removal from the solvent.
Solvent resistance shall be as specified in 3.6.9.
4.5.12 Stability in partially full container. Determine stability and consistency of a three-quarter filled, closed
0.25-liter (8-ounce) glass jar of each component after aging for 7 days at 60 °C (140 °F). Results shall be as
specified in 3.6.4.
4.5.13 Dilution stability. Prepare thinner by mixing 1 volume of thinner prepared from the solvents specified
by the formula being tested in the amounts specified. Reduce 1 part by volume of mixed component from 4.5.1 with
1 part by volume thinner. Then test in accordance with Method 4203.2 of FED-STD-141. Results shall be as
specified in 3.6.5.
4.5.14 Condition in container. When tested in accordance with Method 3011.3 of FED-STD-141, the
individual components shall be readily broken up with a paddle to a smooth, uniform consistency. When tested as
specified in table III, paint, mixed from the components aged for 1 year at ambient laboratory conditions, shall be as
specified in 3.6.7.2. When tested in accordance with ASTM D562, the consistency of the paint, mixed from the
aged components, shall be as specified in 3.6.7.2.
4.5.14.1 Accelerated storage stability. After exposure of components A and B to a temperature of 60 °C
(140 °F) for a period of 14 days, previously unopened containers of components A and B shall be prepared for
4.5.15 Hot distilled water test. Determine resistance to hot distilled water. Six qualification paint and six
reference test panels (see 4.5.1.4) are required from each system. Three qualification paint and three reference
panels are used as test controls for the 82 °C (180 °F) immersion test and the remaining three panels of each paint
system are used as test controls from the 93 °C (200 °F) immersion test. Examine for compliance with 3.6.8.
4.5.15.1 Preparation of panels. Panels shall be mild steel in accordance with QQ-S-698, cold rolled, 90 by 150
by 3.0 millimeters (6 by 10 by 0.125 inches) (nominal) blasted using aluminum abrasive blasting media to a uniform
white appearance with a minimum surface profile of 25 µms (1 mil) (nominal), but not greater than 75 µms (3 mils)
(nominal) peak to valley when measured in accordance with ASTM D4417. Panels shall be vapor degreased before
blasting and care shall be taken to prevent recontamination (especially by fingerprints) before painting. Panels shall
be cleaned after blasting using clean, dry compressed air or vacuum.
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