MIL-DTL-24631A(SH)
TABLE III.
Standard quantitative tests.
Characteristic
ASTM/FED-STD-141 method
Pigment content
D 2698 (see 6.5)
Volatile content
D 2369
Nonvolatile vehicle content
4053.1
Consistency
D 562
Sag resistance
D 4400
Fineness of grind
D 1210
Set-to-touch
D 1640
Dry hard
D 1640
Gloss
D 523 and Method C or E of D 823
Contrast ratio
D 2805 and Method C or E of D 823
Course particles
D 1210
Flash point
D 3278, except where D 56 is
specified (Formula 187).
Mass per unit volume
D 1475
The measured characteristic values shall be in accordance with the
requirements of 3.4.1 and the appropriate specification sheet.
4.5.3 Color (wet reflectance [Rw] and FED-STD-595). Test panels shall
be prepared in accordance with ASTM D 823 Test Methods C or E using a nominal
0.006 in blade film applicator on to a clear plate glass panel of not less
than 1/4 in (nominal) thickness which has been ground to a uniform finish with
1F carborundum. Paint shall be thoroughly cured and hard (not less than 16
hours) at ambient laboratory conditions before proceeding to measuring color.
Panels prepared for color may also be used for color fastness (see 4.5.5)
tests.
4.5.3.1 Apparatus. Reflectance shall be determined using a
reflectometer instrument having a D65 light source (10 degree observer) or C
light source (2 degree observer), a 45 degree illumination angle and a 0
degree viewing angle. The reflectometer shall measure green reflectance in
the range of 0.8% to 2.1% with an error of no more than + 0.05 of the value
being measured. The instrument shall be calibrated in accordance with manu-
facturer instructions and shall be demonstrated to read the color of National
Institute for Science and Technology (NIST) traceable standards with color
values not greater than 3 units different than the color to be measured.
Note: Calibration standard is measured dry.
4.5.3.2 Formulas 184, 185, and 187. Immediately before making an RW
green reflectance, moisten the area of the panel to be measured with a
solution of distilled water with up to 1% clear surfactant (detergent) to a
uniform water covering. Quickly measure the green reflectance. Immediately
remove the panel and inspect the measurement area for complete wetness. If
area is not covered with a uniform layer of water, remoisten and remeasure.
Repeat this process until the removed panel has a uniform film of water at
both the start and completion of the reflectance measurement. Record the
measured reflectance. The wetted green reflectance (RW) shall be in
accordance with the requirements of 3.4.1 and the appropriate specification
sheet.
10
For Parts Inquires call Parts Hangar, Inc (727) 493-0744
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business