MIL-DTL-25421C
TABLE V. Examination of Sheets or Parts for Dimensional Defects
Characteristic
Defect
Length or Width
Varies by more than 1/8 inch or by more than the
tolerances indicated in drawings or requirements, as
applicable.
Thickness
Varies by more than the tolerances indicated in
drawings, specifications, or other requirements. Unless
otherwise specified, the following thickness-tolerance
relationships shall apply:
Specified thickness (inches)
Tolerance (percent)
0.25 or less
± 10
Over 0.25 through 0.50
±7
Over 0.50
±5
4.4.3 Tests of sheets or parts. The sheets or parts shall be subjected to
physical, mechanical, and electrical tests in accordance with Table VI. The unit of
product for determining lot size for these tests shall be one sheet or part. The
sample unit shall be a sufficient area of flat laminate, 0.125 ± 0.010 inch in thickness,
to perform all the applicable tests for Class 1 or Class 2 laminated material, or all the
physical and mechanical tests for Class 3 laminated material. For Class 3 only, the
sample unit shall also include additional flat laminate of sufficient area and suitable
thickness to perform the required electrical tests at 8,500 to 10,000 megacycles.
Unless otherwise specified (6.2), the additional laminate for the Class 3 electrical
tests shall be at least 0.75 inch thick. When required, all sample units shall be cut
into specimens of the number and description specified for the tests of Table VI,
machined to size and suitable for testing. The inspection level for the tests of Table
VI shall be S-1 and the AQL shall be 6.5 defects per 100 units, except that the
minimum sample size shall be three units with an acceptance number of zero for a
sample of that size.
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