MIL-DTL-53039E
4.6.23 Hydrocarbon resistance. Spray the coating on a test panel (see 4.6.1.2 and 4.6.1.3) to a
dry film thickness of 2 ± 0.2 mils (50 ± 5 microns). Air dry the specimen for 168 hours and then
immerse for 168 hours in a hydrocarbon fluid conforming to JP8 at 25 ± 1 °C (77 ± 2 °F).
Panels shall be immersed at a minimum depth of 50%. At the end of the test period, remove and
examine for compliance with 3.6.10.
4.6.24 Acid resistance (only for Green 383, 34094, Dark Green 34082, Green 808, 34102,
Woodland Desert Sage, 34201 and IRR Foliage Green 504, 34160). Using the film prepared and
air dried for 168 hours, place a 3 to 5 ml spot of a 10 percent by volume acetic acid solution on
the surface of the coating. Cover the film with an appropriate size watch glass and allow to stand
for 1 hour. Rinse with water thoroughly, allow to dry, and examine the film for blistering and
color change for compliance with 3.6.11.
4.6.25 Accelerated weathering. Spray the coating on four test panels (see 4.6.1.2 and 4.6.1.3) to
a dry film thickness of 2 ± 0.2 mils (50 ± 5 microns) and air dry for 168 hours. Three panels are
to be tested and one retained as a control. Determine the color and infrared reflectance as in
4.6.2 and measure the 60 and 85 degree gloss. Expose three panels for 800 hours to accelerated
weathering in accordance with ASTM G154 using a UV 340A light source. Measure the 60 and
85 degree gloss and determine the color and infrared reflectance of the exposed film. Examine
the panel for chalking by rubbing with a piece of velvet or cheese cloth. Check for compliance
with 3.6.12.
4.6.26 Super Tropical Bleach (STB) resistance. Spray one 4 by 12 inch test panel (see 4.6.1.2
and 4.6.1.3) to a dry film thickness of 2 ± 0.2 mils (50 ± 5 microns). Air dry the panel a
minimum of 168 hours. Scribe a 1 inch diameter wax ring using a china marker on the painted
surface of the panel. Place approximately 1 ml of STB agent on the panel surface. Do not cover.
Allow to stand 30 minutes then thoroughly wash with water. A STB slurry mix of 40 parts STB
and 60 parts water by weight shall be used. Examine for compliance with 3.6.13.
4.6.27 Chemical agent resistance.
4.6.27.1 Panel preparation. Spray eight test panels pretreated and primed as specified in 4.6.1.2
and 4.6.1.3. Coupons shall be circular discs with a 2.42 inch (61.5 mm) diameter for the chemical
agent testing. Air dry the test panels for 2 hours. Mix the topcoat paint as specified in 4.6.14 and
then spray on the topcoat paint to a dry film thickness of 2 ± 0.2 mils (50 ± 5 microns). Air dry
the panels for 7 days.
4.6.27.2 Test conditions. Because the desorption rate of agents from paint is temperature
dependent, all agent tests shall be conducted at 25 °C (77 °F). Extremely toxic materials are
used in this testing. Agent HD, a vesicant agent, is also a known carcinogen. Agent GD is a
toxic nerve agent, exposure to which is difficult to treat. Consequently, all work shall be
performed in an approved fume hood, and appropriate measures to protect individuals at risk of
exposure shall be taken.
4.6.27.3 Test apparatus. The test apparatus used for both HD and GD testing consist of a
temperature controlled Plexiglas box (approximately 0.5 m x 0.5 m x 1 m) containing five
separate test cells. Four of these cells are used to test sample CARC panels. The fifth is used to
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