MIL-P-85878
3.4 Dimensions. Dimensions of sheets shall be as specified by applicable drawings or specifications. Unless otherwise specified, a tolerance of +1/16 inch (+ 1.59 mm) will be allowed on linear dimensions at 77° +5°F (25° +2.8°C).
3.5 Instruction sheets. When specified in the contract or order, instruction sheets approved by the procuring activity, covering the limitations of the material and the necessary precautions to be observed in handling, storing, cutting, bending, cementing, abrading, and cleaning shall be furnished with each shipping container as specified in section 5. Instructions sheets may refer to material in the handbook T.O. 1-1A-12 (BuWep 01-1A-12) by specific paragraph or page reference. Instruction sheets shall describe all compounds, materials, and equipment mentioned therein in sufficient detail to permit nonproprietary procurement, using Government specifications when available.
3.6 Workability. When any of the procedures of the instruction sheets are followed, the material shall not fail mechanically nor develop any surface or internal defects.
3.7 Color stability. The plastic shall continue to conform to all applicable colormetric requirements after exposure of the color stability test specified in 4.7.2.
3.8 Spectral transmittance. The total spectral transmittance of the plastic of either type shall not exceed 3 percent at a wave length of 535 millimicrons.
3.9 Rate of burning. The sheet shall consist of either nonflammable or slow-burning material. The rate of burning shall not exceed 3.5 inches (88.9 mm) per minute.
3.10 Specific gravity. The specific gravity of the conditioned material shall be less than 1.40.
3.11 Index of refraction. The index of refraction of the conditioned material shall be 1.50 +0.030.
3.12 Water absorption. The water absorption of the conditioned material shall not exceed 7.0 percent.
3.13 Formability. When formed in accordance with the procedure specified in 4.7.11, the plastic shall be in complete contact with the female form without fracture of the specimen.
3.14 Minor optical defects. When tested as specified in 4.7.6, the total number of minor optical defects in the plastic shall not exceed a limit determined by dividing the area of the sheet in square feet by 4.
3.15 Requirements applicable to type I only.
3.15.1 Color. Type I material shall be amber in color.
3.15.2 Thickness tolerance. The nominal thickness of the plastic sheet furnished shall be 0.04 inch (1.0 mm). The actual thickness of the sheet at any point shall be 0.04 +0.004 inch (1.0 mm + 0.10 mm).
3.15.3 Light transmittance. The total visible light transmittance for light of daylight quality shall be at least 36 percent.
3.15.4 Total spectral transmittance. The spectral light transmittance of the material shall not exceed 1 percent throughout the wavelength range from 400-530 millimicrons.
3.15.5 Diffuse spectral transmittance. The diffuse spectral transmittance shall not exceed 2.5 percent at a wavelength of 610 millimicrons.
3.16 Requirements applicable to type II only.
3.16.1 Color. Type II material shall be blue in color.
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