MIL-DTL-24441D(SH)
a.
Type III paints. Prepare six test panels for each of the following systems:
System A
System B
System C
System D
F.1501/
Coat number 1
F.150
F.150
F. 162
Coat number 2
F.151
F.151
F.151
F.161
Coat number 3
F.152
F.156
F.153, 154, 155
F.160
NOTE:
1/
F. indicates formula number.
b.
Type IV paints. Prepare six test panels for each of the following systems:
System D
System E
System
System
System
A
B
C
F.1501/
Coat number 1
F.150
F.150
F.150
F. 162
Coat number 2
F.151
F.152
F.156
F.153, 154,
F. 156
155
NOTE:
1/
F. indicates formula number.
The total dry film thickness, 200 to 250 µms (8 to 10 mils) (nominal) for Type III and Type IV paints, shall be
applied to both sides of panel. Apply paint using standard spray equipment, allowing 16 to 24 hours drying time
between coats at ambient laboratory conditions (nominal 23 °C (73 °F)). Condition coated panels for 1 week after
application of final coat at ambient laboratory conditions (nominal 23 °C (73 °F)). Measure and report the dry film
thickness for each side of each panel.
4.5.15.2 Testing of panels. Immerse three panels in 82 °C (180 °F) distilled water and three panels in 93 °C
(200 °F) distilled water. Remove the panels from the 93 °C (200 °F) tank at the end of 2 weeks, wash, dry, and sand
one side of each panel to a dull finish with a number 100 emery cloth. Wash, dry, and recoat the sanded side with an
additional 50- to 75-µm (2- to 3-mil) (nominal) coat of coat number 3 for Type III paints or coat number 2 of Type
IV paints. Cure for 1 week and reimmerse in 93 °C (200 °F) distilled water for 2 weeks. Remove the panels and
examine for appearance, blistering, and adhesion. Repeat the preceding for the panels immersed in 82 °C (180 °F)
distilled water after 10 weeks immersion. That is, remove, prepare, recoat and the reimmerse for 2 weeks.
4.5.15.3 Blistering. Determine degree of blistering in accordance with ASTM D714. Blisters appearing within
6 millimeters (0.25 inch) (nominal) from the edge of the panel that are less than 1.6 millimeters (0.0625 inch) in
diameter shall be disregarded. Qualification test panels shall perform at least as well as the reference panels for
blistering both the substrate and to the original paint in the recoated area.
4.5.15.4 Adhesion. Determine adhesion of both sides of each panel using a tensile adhesion tester in
accordance with ASTM D4541 to determine any loss of adhesion. Adhesion shall be as specified in 3.6.8.
4.5.17 Epoxy equivalent. Determine the epoxy equivalent weight of the nonvolatile from Component B.
Separate the pigments from Component B in accordance with ASTM D2698. Remove solvents from the resinous
portion by evaporating on a steam bath. Determine epoxy equivalent weight of the nonvolatile vehicle in
accordance with ASTM D1652. Epoxy equivalent weight shall be as specified in the appropriate specification sheet.
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