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|  MIL-E-24763A(SH)
w/INT. AMENDMENT 1
3.7.1. Color. The color shall be characteristic of the pigments used and shall match the following as
specified (see Table VI and 4.6.5):
a. Colors defined by Tristimulus values shall match the following when measured in accordance with
4.6.5:
Tristimulus values
Colors defined by tristimulus values
L
a
b
Navy Haze Gray No. 27
+56.0 -1.83 -1.37
b. All other colors shall match the FED-STD-595 number specified in Table VI when measured in
accordance with 4.6.5.
3.7.1.1. Color deviation. The color deviation of the paint shall be obtained as specified in 4.6.5. The
measured color deviation terms [Delta (Ć)E, ĆA, ĆB, ĆL] from the appropriate Haze Gray No. 27 [see 3.7.1(a)] or
specified FED-STD-595 color card in Commission Internationale de l'Eclairage (CIE; International Commission on
Illumination) LAB units shall be not greater than the CIELAB units listed below as either positive or negative
(+ or -) values:
Color deviation values
Colors defined by tristimulus values
ĆE
ĆA
ĆB
ĆL
Navy Haze Gray No. 27
0.5
0.3
0.3
0.3
Color deviation values
FED-STD-595 color no.
ĆE
ĆA
ĆB
ĆL
26173, 26373, 36173, 36270, 36373
0.5
0.3
0.3
0.3
All other colors
1.8
1.0
1.0
1.0
3.7.2. Accelerated weathering. When prepared as specified in 4.6.11.1 and tested in accordance with
4.6.13, films of the enamels shall meet the following requirements:
a.
Be not rated less than 9 (1 percent) for checking (ASTM D660)
b.
Be not rated less than 9 for cracking (ASTM D661)
c.
Be not rated less than 10 for blistering (ASTM D714)
d.
Gloss retention shall be not less than 65 percent of that measured prior to weathering (ASTM D523)
e.
The CIELAB color difference (delta E), delta L, delta a, and delta b units, shall not be greater than 1.0
CIELAB units from the original color values measured before testing (ASTM D2244)
f.
The degree of chalking shall not be more than 8 when tested in accordance with ASTM D4214.
3.7.3. Volatile organic content. The VOC of the enamel shall not be greater than the quantities allowed in
Table IV when determined as specified in 4.6.8 (see 6.3).
3.7.4. Long term exterior exposure . When tested in accordance with 4.6.15, films of the enamel shall meet
the following requirements:
a.
60 Gloss must be less than 50% of that measured prior to testing.
b.
Chalking shall be rated not less than number 8 of ASTM D4214.
c.
Checking shall be rated not less than 9 (1 percent).
d.
Cracking shall be rated not less than 9.
10
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