MIL-DTL-5755E
4.6 Tests.
4.6.1 Abrasion. A soft unbleached flannel cloth shall be dusted on the nap side with dry
soil that has passed through a 200-mesh sieve. The entire reflecting surface of the mirror shall be
rubbed lightly with this cloth for 30 seconds using a rotary motion. This rubbing cycle shall be
repeated 30 times. The reflectivity of the mirror shall not be reduced more than 2 percent as
determined by the test of 4.6.9.
4.6.2 Temperature shock. The mirror shall be subjected to the temperature shock test of
MIL-STD-810, Method 503. There shall be no separation of the reflecting film from the
supporting medium or other detrimental effects on the serviceability of the mirror.
4.6.3 Humidity. The mirror shall be subjected to the humidity test of MIL-STD 810,
Method 507. The clarity of the image shall not be affected and the specular reflectivity shall not
4.6.4 Salt fog. The mirror shall be subjected to the salt fog test of MIL-STD-810, Method
509 except the spray shall be for a continuous 50 hours. There shall be no reduction in clarity when
subjected to the test of 4.6.8. The reflectivity shall not be reduced more than 2 percent as determined
by the test of 4.6.9. The residue remaining on the mirror after completion of the tests shall be
removed by cleaning with a soft unbleached Canton flannel cloth before the results of the tests are
determined.
4.6.5 Vibration. The mirror shall be subjected to the vibration test of MIL-STD-810,
Method 514, "General Vibration", procedure. There shall be no detrimental effect on the
serviceability of the mirror assembly.
4.6.6 Adhesion of reflecting surface. At the completion of the temperature shock test of
4.6.2, tape conforming to A-A-113, one inch wide, shall be applied firmly to the reflecting
surface and stripped off quickly at room temperature. The mirror shall be examined for
detachment of the reflective cologne.
4.6.7 Demagnification. The radius of curvature shall be determined by one of the
following options:
a.
With a dial-type gage with the plunger near the center of the mirror.
b.
By three fixed legs that need not be equispread.
c.
With an accurately formed template.
d.
With any other means acceptable to the inspector.
4.6.8 Image. Clarity of image shall be determined by viewing with the naked eye the
reflection of an object in the mirror. Examination for noticeable distortion of the image shall be
made as the mirror is rotated 45 degrees both to the right and left of the line of sight.
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