MIL-DTL-508K
4.3 Methods of inspection.
4.3.1 Colorfastness evaluation testing. When testing for colorfastness properties, each color
shall be evaluated, whenever possible, separately and reported as such. In cases where the print
pattern does not allow for the evaluation of each color separately, the test results should indicate
which colors were evaluated together.
4.3.2 Spectral reflectance test. Spectral reflectance data shall be obtained from 600 to 860
nanometers (nm) for Class 2, 3, 4 and 5 on a spectrophotometer relative to a barium sulfate
standard, the preferred white reference standard. Other white reference materials may be used,
provided they are calibrated to absolute white; e.g. Halon, magnesium oxide, or vitrolite tiles.
The spectral band width shall be less than 26 nm at 860 nm. Reflectance measurements shall be
made by either the monochromatic or polychromatic mode of operation. When the
polychromatic mode of operation is used, the spectrophotometer shall operate with the specimen
diffusely illuminated with the full emission of a continuous source that simulates either CIE
Source A or CIE Source D65. The specimen shall be viewed at an angle no greater than 10°
from normal, with the specular component included. Photometric accuracy of the
spectrophotometer shall be within 1 percent and wavelength accuracy within 2 nm. The standard
aperture size used in the color measurement device shall be 1.0 to 1.25 inches in diameter for
Woodland camouflage and 0.3725 inches or larger for the Universal camouflage. Areas to be
measured for each color shall be lightly marked with a circle, at least 1.50 inches in diameter, on
the reverse side of the fabric, and at least 6 inches from the selvage. The specimen shall be
measured as a single layer backed with layers of the same fabric and shade. For Class 4
Woodland pattern cloth, three backing layers shall be used for Light Green 354, Dark Green 355
and Brown 356 colors. The specimen for Class 5 Universal pattern cloth, shall be measured as a
single layer backed with four layers of the same shade. Measurements shall be taken on a
minimum of two different areas and the data averaged. Any color having spectral reflectance
values falling outside the limits at four or more of the wavelengths specified shall be considered
a test failure.
4.4 Toxicity test. The contractor must furnish information, which certifies that the finished
product is composed of materials, which have been safely used commercially or provide
sufficient toxicity data to show compatibility with prolonged, direct skin contact. At a minimum,
toxicity data should include results from a primary dermal irritation study in laboratory animals
and a repeated insult human patch test (Modified Draize Procedure). The latter must be
conducted under the supervision of a qualified dermatologist using at least 100 free-living
individuals.
4.4.1 Toxicity documents. All finishes/chemicals used to process the garment shall be
identified and accompanied by the appropriate Material Safety Data Sheet (MSDS) information.
The use of chemicals recognized by the Environmental Protection Agency (EPD) as human
carcinogens is prohibited.
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