MIL-PRF-24596B(SH)
3.6.4 Brushing properties. When tested in accordance with 4.6.8, the coating shall brush satisfactorily in all
respects and shall dry to a smooth, uniform film, free from seeds, runs, or sags.
3.6.5 Flexibility. When tested in accordance with 4.6.9, a film of coating shall show no checking, cracking, or
flaking.
3.6.6 Knife test adhesion. When tested in accordance with 4.6.10, the coating film shall be difficult to furrow
off with the knife, shall not flake, chip, or powder, and shall show neither loss of inter-coat adhesion, nor loss of
adhesion to the surface of the substrate. The knife cut shall show beveled edges.
3.6.6.1 Adhesion test. When tested in accordance with table IV, a film of coating shall adhere tightly to the test
panel.
3.6.7 Fluid resistance (except Class 4).
3.6.7.1 Water resistance (does not apply to Grades A and B water-based coatings). When tested in accordance
with 4.6.11, a film of coating shall show no wrinkling or blistering immediately after removal of the wetted sponges.
The coating shall be no more than slightly affected when examined 2 hours after removal of the wetted sponges.
After 24 hours of air drying, the portion of the panel which was covered by the wetted sponges shall be almost
indistinguishable with regard to hardness and adhesion from the portion which was not immersed. A slight
discoloration of the portion of the panel covered by the wetted sponges shall be permitted.
3.6.7.2 Hydrocarbon fluid resistance (does not apply to Grades A and B water-based coatings). When tested in
accordance with 4.6.12, a film of coating shall show no blistering or wrinkling and no more than a slight whitening
or softening upon removal of the fluid wetted sponge. After 2 hours of air drying, the portion of the panel that was
covered by fluid wetted sponge shall be almost indistinguishable with regard to hardness, color, and gloss from a
panel prepared at the same time, but not immersed.
3.6.7.3 Salt spray resistance (does not apply to application C, D, and E coatings). When tested in accordance
with 4.6.13, a film of coating examined immediately after removal from the test shall show no more than a trace of
corrosion in accordance with ASTM D610 and no more than five scattered blisters no larger than 1 millimeter in
diameter.
3.6.7.4 Condensation blister resistance. When tested in accordance with 4.6.14, a film of coating shall show a
maximum ASTM D714 blister rating of 8 and be rated few or better. Blisters within 12 millimeters of all edges
shall be disregarded.
3.6.8 Resistance to exudate formation (Grades A and B water-based coatings only). When tested in accordance
with 4.6.15, a film of coating shall exude no fluid (liquid) material from the paint film and paint film shall not be
tacky.
3.6.9 Washability (except Class 4). When tested in accordance with 4.6.16, a film of coating shall retain a
minimum of 50 percent of its original gloss.
3.6.10 Flash rust resistance (Grades A and B, application A water-based coatings only). When tested in
accordance with 4.6.17, there shall be no evidence of flash rust or pinhole corrosion.
3.6.11 Resistance to growth of mold. When tested in accordance with table IV, after 4 weeks the test panels
shall have a minimum ASTM D3274 rating of 8.
3.6.12 Freeze-thaw resistance (Grades A and B only). When tested for five cycles in accordance with table IV,
the coating shall not: (a) exhibit broken emulsion or (b) be agglomerated or coagulated. There shall been no change
in: (a) hiding power, (b) gloss, (c) fineness of grind, or (d) speckiness. Color shall match the standard color card of
the appropriate FED-STD-595 color. Viscosity shall be within 10 percent of the viscosity of the control.
Brushability and sprayability shall be the same as the control.
3.6.13 Recoatability. When tested in accordance with 4.6.18, the paint shall not wrinkle, blister, or lift. When
cut with a knife blade, the overcoat paint shall not lose adhesion or flake away from the test paint film. The surface
of the recoat paint shall be smooth.
10
For Parts Inquires call Parts Hangar, Inc (727) 493-0744
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business