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|  MIL-C-83409(USAF)
3.6.3 Weathering resistance
3.6.3.1 The coated visors shall show no yellowing or other change,
or loss of coating adhesion.
4. QUALITY ASSURANCE PROVISIONS
4.1 Responsibility for inspection. Unless otherwise specified in the
contract or purchase order, the supplier is responsible for the per-
formance of all inspection requirements as specified herein. Except
as otherwise specified in the contract or order, the supplier may use
his own or any other facilities suitable for the performance of the
inspection requirements specified herein, unless disapproved by the
Government. The Government reserves the right to perform any of the
inspections set forth in the specification where such inspections are
deemed necessary to assure supplies and services conform to prescribed
requirements.
4.1.1 All of the quality assurance provisions as specified in MIL-V-43511
shall apply to the coated visors in addition to the provisions stated
herein.
4.2 Abrasion resistant coating durability
4.2.1 Test specimens. The specimens for conducting the coating
durability tests shall be flat panels which are coated by the same
process during and concurrently with the visors.
4.2.2 Abrasion resistance. The haze and luminous transmittance of the
coated specimens shall be determined before and after the abrasion test
in accordance with Method 3022 of FED-STD-406. The abrasion test will
be performed in accordance with Method 1092 of FED-STD-406 using
CS10F calibrase wheels for one hundred cycles under a 500 gram load.
4.2.3 Coating adhesion
4.2.3.1 Adhesion test method. The coating is cut or scribed in a
cross hatch pattern. A tape, 3M670, is applied to the cross hatched
area and firmly pressed down. The tape is removed using a snap motion
90 degrees to the test specimen.
4.2.3.2 The adhesion test shall be applied to the unexposed test specimen
without any loss of adhesion noted. Test specimens shall be subjected
to humidity tests as specified in Method 507 of MIL-STD-810, for
240 hours (10 cycles) and then subjected to the adhesion test.
3
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