MIL-PRF-85285E
3.7.5 Gloss. The specular gloss of the coating, when tested as specified in 4.6, shall be as
shown in table III at a 60° angle of incidence.
TABLE III. Specular gloss.
Color type
Minimum
Maximum
Gloss
90
---
Semi-gloss
15
45
Camouflage (flat or lusterless)
---
5
A maximum of 10 for camouflage colors at an 85° angle of incidence.
3.7.6 Opacity (hiding power). The coating shall have a contrast ratio of no less than 0.95 for
all colors except yellow (FED-STD-595, Color 13538), which shall have a contrast ratio of not
less than 0.90, when cast to a dry film thickness of 1.9 to 2.1 mils [48 to 53 micrometer (m)] on
a black and white chart and tested in accordance with 4.6.5.
3.7.7 Adhesion. The coating shall have a rating of no less than 4A when examined in
accordance with ASTM D3359 (see 4.6.6).
3.7.8 Flexibility.
3.7.8.1 Impact flexibility. The coating shall meet the following minimum requirements for
ambient temperature impact flexibility: types I, III and IV, 40 percent; and type II, 5 percent;
when tested in accordance with 4.6.7.1.
3.7.8.2 Low-temperature flexibility (Type I, Type III and Type IV only). The type I,
type III, and type IV coatings, at a temperature of -51 ±3 °C (-60 ±5 °F), shall exhibit no
cracking when bent, coated side away, over a 1.0 inch (in.) [25.4 millimeter (mm)] mandrel for
gloss and semi-gloss colors, and over a 2.0 in. (50.8 mm) mandrel for camouflage colors, when
tested in accordance with 4.6.7.2.
3.8 Resistance properties.
3.8.1 Fluid resistance. When immersed in lubricating oil conforming to MIL-PRF-23699,
hydraulic fluid conforming to MIL-PRF-83282, and JP-5 fuel conforming to MIL-DTL-5624,
the coating shall not exhibit any blistering, softening, or other coating defects. Slight staining of
the coating is acceptable (see 4.6.8).
3.8.2 Weather resistance. For types I, II, and III, after exposure in Xenon-arc
weatherometer for 500 hours as specified in 4.6.9: (a) 60° specular gloss of the coating shall be a
minimum of 80 Gloss Units (G.U.) for gloss colors; a minimum of 15 G.U. for semi-gloss colors;
a maximum of 5 G.U. for camouflage colors, and (b) the coating color difference (ΔE) shall have
a value of less than 1.0 when compared to an unexposed sample of the same batch using
CIELAB color coordinates.
For type IV, after exposure in Xenon-arc weatherometer for 3000 hours as specified in
4.6.9: (a) The 60° specular gloss of gloss colors shall have a change in Gloss Units (G.U.) of
less than 20 from the unexposed initial value. (b) The semi-gloss colors shall have a minimum of
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