MIL-DTL-43511D
4.4.12 Bayer abrasion resistance. The visor / or 6 curve lenses shall be tested using the
oscillating sand method. The abrasion test will be performed in accordance with ASTM F 735
using 500 grams Alundum® Norton ZF #12 (Saint-Cobain) for 600 cycles. A CR-39 reference
lens or equivalent of same diopter will be tested in parallel to the coated specimen. The resulting
ratio will be the change in haze, tested using ASTM D 1003, of the reference specimen divided
by the change in haze of the coated specimen.
4.4.13 Coating adhesion. The tape test adhesion shall be performed using ASTM D 3359. The
coated visor shall be subject to a crosshatch (cross hatch cutter with a 1.0 mm spacing) and then
subject to 3 consecutive tape pulls. A tape having an adhesion to steel of 45-55 oz per inch shall
be applied to the cross hatched area and firmly pressed down. Tape shall be cut to a length of
approximately three inches long and firmly applied to the visor. To ensure good contact with the
visor, rub the tape firmly with an eraser. Within 90 + 30 seconds of application, remove the tape
by seizing the free end and rapidly (not jerked) back upon itself at as close to an angle of 180o as
possible. This adhesion test shall be repeated after the visor is subjected to the humidity test, as
specified in MIL-STD-810, Method 507, Procedure III, for 120 hours (5 cycles).
4.4.14 Weathering resistance. Visors shall be exposed in a weatherometer in accordance with
MIL-STD-810, method 505.3, procedure II. For visors which contain external coatings, the
coating adhesion test shall be performed after weather resistance tests have been completed.
4.4.15 Chemical resistance. The visors shall be exposed to the following chemicals:
a.
Insect repellent, controlled release (DEET)
b.
JP4 aircraft turbine fuel
c.
JP8 aircraft turbine fuel, kerosene type
d.
Aircraft lube oil, turbine engine, synthetic base
e.
Aircraft hydraulic fluid, fire-resistant, synthetic base
f.
Degreasing solvent, type I (mineral spirits)
g.
Cleaning compound, turbine engine gas path, 20 % solution
The chemical exposure will be tested for a 10 hour period at ambient room temperature
conditions. The chemicals shall be contained by sealing an o-ring (0.5 inch or 0.75 inch
diameter) to either the concave or convex surface of the visor. At the end of the test, the surface
shall be thoroughly cleaned using a mild detergent and water followed by drying with a soft cloth
or lens tissue. The visor shall then be visually inspected for visible damage and shall pass the
requirements of 3.5.3 and 3.5.6 ensuring the same areas that were exposed to the chemicals are
tested for these requirements. The haze and transmittance shall be measured before and after the
exposure to the chemicals. Each visor shall have two (2) locations tested for each chemical type
(i.e. left and right side of the visor).
5. PACKAGING
5.1 Packaging. For acquisition purposes, the packaging requirements shall be as specified in the
contract or order (see 6.2). When packaging of materiel is to be performed by DoD or in-house
contractor personnel, these personnel need to contact the responsible packaging activity to
ascertain packaging requirements. Packaging requirements are maintained by the Inventory
Control Point's packaging activities within the Military Service or Defense Agency, or within the
military service's system commands. Packaging data retrieval is available from the managing
Military Department's or Defense Agency's automated packaging files, CD-ROM products, or by
contacting the responsible packaging activity.
6. NOTES
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