INCH-POUND MIL-PRF-13830B 9 January 1997 SUPERSEDING ...

MIL-PRF-13830B
APPENDIX C
C.3.8.5 Adhesion. The coated optical surface shall show no evidence of coating
removal when cellophane tape is pressed firmly against the coated surface and
quickly removed at an angle normal to the coated surface.
C.4. VERIFICATION
C.4.1 General provisions. Unless otherwise specified in the contract or purchase
order, the supplier is responsible for the performance of all inspection requirements
as specified herein. Except as otherwise specified, the supplier may utilize his own
facilities 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 that supplies
and services conform to prescribed requirements (See C.6.2).
C.4.1.1 Witness piece. Unless otherwise specified, witness pieces as defined in
C.4.1.2 or coated components may be used to test the optical and durability
requirements of the coated component (See C.4.2, C.4.3 and C.6.2). The witness
pieces shall be positioned in the coating chamber such that they represent the optical
and durability characteristics of the whole evaporated lot (See C.6.3). The
Government reserves the right to test the actual coated component with the same
test to which the witness pieces were subjected, except in the case where the known
Knoop hardness of the coated component is less than 450 kg/mmì, the moderate
abrasion test of C.4.5.11 shall be utilized. Should a component fail, even through the
representative witness pieces pass the test, the lot shall be rejected.
C.4.1.2 Characteristics of the witness piece. When the witness pieces are used to
test the optical and durability requirements of the coated component they shall
exhibit the following characteristics:
a. The witness piece shall be such that it presents no difficulty in
measuring and testing the optical and durability requirements of the
coating.
b. The witness piece shall have a surface finish similar to that of the
component to be coated.
c. The witness piece shall simulate the axial thickness of the component
by either computational methods or using a witness piece that has
the same thickness as the coated component for the measurement of
transmission characteristics.
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