MIL-PRF-13830B
3.2.3 Bonding system. Bonding system for glass to metal bonding shall be
in accordance with Appendix D.
3.2.4 Sealing compound. Sealing compound shall be in accordance with
Appendix E.
3.2.5 Reflection reducing film. Reflection reducing film required for coating
of specified optical surfaces shall be in accordance with Appendix C.
3.2.5.1 Reflecting surfaces . Aluminized reflecting surfaces shall be in
accordance with Appendix B.
3.3 Mechanical dimensions. Optical elements shall conform to the
mechanical dimensions and optical data specified on the drawings or in the
contract.
3.3.1 Rim edges. Rim edges of all optical parts shall have a chamfer of
0.020 inch - 0.010 at 45 degrees ± 15 degrees as measured along the face width
unless otherwise specified by the drawing. Edges meeting at angles of 135
degrees and larger need not be beveled unless specified by the drawings.
3.4 Finish and defects. Finish and defects of the optical glass shall conform
with requirements of this specification or as indicated on applicable drawings or
optical diagrams.
3.4.1 Glass defects. Striae, cords, ream, bubbles, seeds, strain, laps, folds
in pressings, or any other defect located in such a point, plane, or position as to
impair the performance of the element shall be cause for rejection of that
element.
3.5 Optical glass surface quality.
3.5.1 Optical drawings and diagrams. Component optical drawings shall
indicate surface quality, and optical system diagrams shall indicate the
diameter of an axial beam of rays.
3.5.1.1 Designation of defect size. Limiting sizes of surface defects shall be
designated on the drawings by two numbers which refer to two graded sets of
surface quality standards per Drawing C7641866. The first number shall refer
to scratches and the second number shall refer to digs (see 6.3).
3.5.2 Scratches.
3.5.2.1 Circular element. The combined length of maximum size scratches
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