gal\)\). This coating is lead and chromate free. The coating is supplied as a kit.

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MIL-PRF-22750G

3.5.3 Accelerated storage stability. After being tested as specified in 4.7.11, the coating shall meet

all of the requirements of this specification. Each component shall be free of the defects listed in

3.5.2.1 and 3.5.2.2, and when prepared as specified in 4.7.13, the admixed coating shall be a

smooth homogeneous mixture free from grit, seeds, lumps, and skins.

3.5.4 Freeze-thaw stability (class W only). After being tested in 4.7.12, the coating shall meet all

of the requirements of the specification. Each component shall be free of defects listed in 3.5.2.1

and 3.5.2.2 and when prepared as specified in 4.7.13, the admixed coating shall be a smooth

homogeneous mixture free from grit, seeds, lumps and skins.

3.5.5 Mixing properties and pot life. When tested as specified in 4.7.13, smooth homogeneous

mixture shall result. The mixed coating shall be free from grit, seeds, skins, or lumps. After 4 hours

in the closed container, the viscosity of the admixed and thinned coating, if required, shall not

exceed 70 seconds, as specified in 4.7.13. After 8 hours aging, as specified in 4.7.13, the coating

shall show no signs of gelation.

3.5.6 Spraying properties. When tested as specified in 4.7.14, the coating shall spray satisfactorily

in all respects and shall show no running, sagging, or streaking. The dried film shall show no

dusting, mottling, or color separation and shall present a smooth finish free from seeds.

3.5.7 Color. The admixed coating, when tested as specified in 4.7.15, using CIELAB color

coordinates, shall have a color difference Delta (Δ)E value of less than 1 when compared to the

specified color chip in FED-STD-595.

3.5.8 Adhesion. The assessment of the adhesion of the coating film shall be determined by its

ability to not peel from the substrate when tested as specified in 4.7.16. The resultant test rating

shall be classified as scale 4A or better.

3.5.9 Flexibility. A film of coating, tested as specified in 4.7.17, shall withstand bending without

cracking, flaking or loss of adhesion.

3.5.10 Water resistance. When tested as specified in 4.7.18, a film of the coating shall show no

blistering or wrinkling and no more than a slight whitening or softening immediately upon removal

from the water. Film softening shall not exceed a 2 pencil hardness difference (see ASTM D3363)

from an unexposed film with identical cure history prior to water exposure. After 2 hours air

drying, the portion of the panel that was immersed, shall be almost indistinguishable with regard to

adhesion, hardness, color and gloss from an unexposed film with identical cure history prior to

water exposure.

3.5.11 Hydrocarbon fluid resistance. When tested as in 4.7.19, a film of the coating shall show no

blistering or wrinkling when examined immediately after removel from the hydrocarbon test fluid.

When examined 2 hours after removal, there shall be no excessive softening, whitening or dulling.

Film softening shall not exceed a 2 pencil hardness difference (see ASTM D3363) from an

unexposed film with identical cure history prior to the hydrocarbon exposure. After 24 hours dry,