MIL-DTL-13455E
4.5.3 Transmission analysis test.
4.5.3.1 Apparatus. The instrument used for this test shall be a spectrophotometer capable
of isolating a spectral based in the order of magnitude of 1 millimicron or less in width and
employing photometric means for measuring the percentage of the incident light transmitted.
4.5.3.2 Procedure. Light of the wavelength range 360 to 760 millimicrons inclusive shall
be directed at the surface of incidence of the light filter, from a direction normal to it, and the
percent of transmission measured at the wavelength values specified in table I.
4.5.3.3 Transmission evaluation. The product of the spectral transmission in % (T) and
the rod visibility factor (R) shall be determined for each wavelength listed in table I. The product
of T and the cone visibility factor (C) shall be determined for each wavelength listed in table I.
When both products have been obtained for each specified step, the sum of all the products of R
times T and the sum all the products of C times T shall be in accordance with 3.4.1.1.2.
T = Spectral transmission, %.
R = Rod visibility factor.
C = Cone visibility factor.
4.5.3.4 Reflection. To determine conformance to 3.4.2, the light filter shall be
conditioned for not less than 2 hours at 77 +5°F, and while at that temperature, shall be placed in
light conforming to standard illuminant C in accordance with procedure A of ASTM D1003. The
percentage of reflection shall be measured with photometric equipment. The filter shall be placed
in the light path at any angle above the critical angle of refraction, and adjusted to achieve
maximum reflection from the outer (normally exposed) surface.
4.5.3.5 Weathering test. Light filters shall be subjected to accelerated weathering in
accordance with ASTM D1435. Filters shall be attached to panels of a size and shape to permit
their installation on the apparatus turntable. Filters shall be located on the panels in such manner
that, when the panels are mounted on the turntable, the area to be tested for light transmission
shall be 4.50 +0.25 in. from the center of turntable rotation. Filters shall be mounted with the
outer side exposed. At the completion of the weathering procedure, filters shall be subjected to
the test specified to determine conformance to 3.4.3.
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 or Defense Agency, or within the Military
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