A-A-52432B
3.1.2 Mirror coating. The reflecting surface of the mirror coating shall be a silvered coating, uniform in color, and free from stains, scratches, blisters, and misses.
3.1.3 Chromium. Vacuum metalized or sputtered chromium may be used in place of base silvering operation.
3.1.4 Mirror case. Mirror case shall be made of low-carbon steel, 0.024 inch temper 2 to 5.
3.1.5 Mirror mounts. Mirror mounts shall be made from carbon steel (G10200 to G10350) and zinc plated per ASTM B633. Ozone depleting substances, such as 1,1,1 Trichloroethane, shall not be used. Approved, alternative methods or solvents shall be used in place of ozone depleting substances.
3.2 Design and construction. This CID is not intended to limit construction to features other than as shown in figures 1 through 7, by dimension, notation, or reference documents.
3.3 Specular reflectivity. With an angle of incidence of 45 degrees, total reflective light in the visible range shall exceed 50 percent when tested in accordance with SAE J964.
3.4 Range of convexities. Convex mirror shall have an average radius of curvature not less than 20 inches and not more than 60 inches when measured with a spherometer.
3.5 Vibration. The mirror assembly shall show no evidence of damage when subjected to being vibrated for 1 hour in each of its three axes. Vibration shall be in a periodic cycle from 10 to 55 and back to 10 cycles per second through an amplitude of 0.03 inch (total excursion
0.06 inch).
3.6 Temperature stability. When subjected to specified temperatures, mirrors shall not show any evidence of discoloration, silvering deterioration, or reduction in reflectivity. A disassembled mirror shall be placed in a cold chamber and the temperature reduced to -65 degrees Fahrenheit (°F) ± 5°F for 2 hours. The mirror shall then be removed from the cold chamber and returned to room temperature. It shall then be placed in an oven with ambient temperature of 200°F for 2 hours. Possible reduction in reflectivity shall be measured visually comparing the reflected shade of a sheet of white paper with actual shade of the paper.
3.7 Abrasion resistance. When subjected to abrasion and cleaning as specified, the reflectivity of the mirror shall not be reduced by more than 2 percent. The reflecting surface shall be cleaned with a soft, unbleached cloth and dusted on the nap side with dry soil passed through a 200-mesh sieve. The reflecting surface shall be rubbed with the cloth for 30 seconds using a rotary motion. The foregoing cleaning cycle shall be repeated 30 times. Mirror shall be examined for any visible damage due to the above abrading and shall then be tested as specified in 2.8.
3.8 Corrosion resistance. When subjected to corrosive solution as specified, mirror shall evidence no discoloration, silvering deterioration, or any visually apparent reduction in
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