MIL-PRF-38169A
spectral transmittance of the visor and goggle lens in the range between 380 and 770 nm shall be
2% (± 0.5%)
4.4.14 Durability of coatings for class 3 visor and goggle lenses. Before and after subjecting a
class 3 coated lens to any durability of coating tests, the coated lens shall be thoroughly and
carefully cleaned to remove dirt, oil, film, finger marks, and grease marks, using a mild detergent
and water followed by drying with a soft cloth or lens tissue. Tests 4.4.14.1 and 4.4.14.2 shall be
performed on the metallic coating of the clean class 3 lens.
4.4.14.1 Adhesion of metallic film. A strip of pressure sensitive cellophane tape shall be firmly
pressed lengthwise on the metallic coated surface of the class 3 lens so that a minimum of 6 inches
of the tape adheres to the lens. The cellophane tape shall be 1 inch in width and shall possess a
minimum adhesion value of not less than 40 ounces per inch of width. The tape shall be removed
quickly with a snap action which exerts the greatest possible stripping effect on the coating.
4.4.14.2 Abrasion resistance. An optical coating abrasion tester, an example of which is shown
in figure 5, shall be rubbed across the surface of the clean, coated lens from one point to another,
over the same path, for 20 complete cycles with the force of 2.0 to 2.5 pounds continuously
applied. Wherever possible, rubs of about 1 inch length are preferred. After the rubbing has been
completed, the lens shall be thoroughly cleaned as described in 4.4.14 and the surface shall be
visually inspected (unaided eye) for evidence of abrasion or removal of coating. An alternate
surface abrasion procedure is contained in ASTM D 1044. Superficial abrasion which does not
degrade the filter effectiveness is permissible.
4.4.15 Salt spray. The visor and goggle lens shall be tested for resistance to salt spray specified
in RTCA/DO-160.
4.4.16 Fungus. The visor and goggle lens shall be tested for resistance to fungus specified in
RTCA/DO-160.
4.5
Requirements cross-reference matrix. Table III provides a cross-reference matrix of the
section 3 requirements tested or verified in this section .
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
packaging activity within the Military Department or Defense Agency, or within the Military
Department's System Command. Packaging data retrieval is available from the managing Military
Department or Defense Agency automated packaging files, CD-ROM products, or by contacting
the responsible packaging activity.
6.
NOTES
9
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