MIL-PRF-43906D
4.4.12 Spectral reflectance tests. Spectral reflectance data shall be determined on the face
side and shall be obtained from 600 to 860 nm respectively, at 20 nm intervals on a
spectrophotometer, relative to a barium sulfate standard, the preferred white standard. Other
white reference materials may be used, provided they are calibrated to absolute white; e.g.,
magnesium oxide, or vitrolite tiles. The spectral band width at 860 nm shall be less than 26
nm. Reflectance measurements shall be made by either the monochromatic or polychromatic
mode of operation. When the polychromatic mode 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 measured as a
single layer backed with two layers of the same fabric and shade. Measurements shall be
taken on a minimum of two different areas, and the data averaged. The measurement areas
should be at least 6 inches away from the edges of the finished cloth. 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. Any color having spectral reflectance values falling outside
the limits at four or more of the wavelengths specified in 3.5.1 for Type I or in 3.5.2 for Type
II shall be considered a test failure.
4.4.13 Pattern execution. The pattern on the waterproof cloth shall be matched to the pattern
drawing (see 6.4).
4.4.14 Toxicity assessment. The waterproof cloth shall be tested for toxicity as follows:
a) Title 40, Code of Federal Regulations, 1994 Edition;
Section 798.4100- Dermal Sensitization
Section 798.4470- Primary Dermal Irritation
Section 798.4500- Primary Eye Irritation
Marzulli, F. & H. Maibach, "Contact Allergy: Predictive Testing in Humans",
Advances in Modern Toxicology, Volume 4, pp 353-372, 1977.
b) As an alternative to animal and human testing, the contractor may provide information
which certifies that the finished product was composed of chemicals or materials
which have been safely used commercially where prolonged skin contact has occurred.
4.4.15 Mildew resistance. ASTM G-21.
5. PACKAGING
5.1 Packaging. For acquisition purposes, the packaging requirements shall be as specified in
the contract or order (see 6.2). When actual packaging of materiel is to be performed by DoD
personnel, these personnel need to contact the responsible packaging activity to ascertain
requisite packaging requirements. Packaging requirements are maintained by the Inventory
Control Point's packaging activity within the Military Department System Command.
Packaging data retrieval is available from the managing Military Department's or Defense
Agency's automated packaging files, CD-ROM products, or by contacting the responsible
packaging activity.
6. NOTES
(This section contains information of a general or explanatory nature that may be helpful, but
is not mandatory.)
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