MIL-DTL-25421C
air or gas pockets, patches, porosity, and other similar defects as defined in MIL-P-
9400. The material shall be essentially void free.
3.4.6.1 Allowable defects. Allowable defects in the plastic laminate, including
repairable defects, shall be limited to those described in the applicable drawing or
specification.
4.
VERIFICATION
4.1 Classification of inspections. The inspections performed under this
specification shall be one of the following classifications:
(a) First article inspection (4.2).
(b) Quality conformance inspection (4.3)
4.2 First article inspection. First Article inspection shall include all the
examinations and tests of this specification (4.4) except the examination of
preparation of delivery (4.4.4). Unless otherwise specified (6.2), no material shall be
submitted for acceptance until the first article samples prescribed in 4.2.1 have been
subjected to first article inspection, and determined to be satisfactory, or equivalent
certification and data (4.2.2) have been approved. However, approval of the first
article samples or of equivalent certification and data shall not eliminate the need for
verification for conformance to the requirements of this specification.
4.2.1 Sampling for first article inspection. For first article inspection, the
following samples, certified as representative of the materials to be used and the
products to be furnished.
Finished glass cloth 1 linear yard, full width
Fibrous glass mat 4 linear yards, full width
Laminating resin 1 gallon
Inorganic filler 1 pound
Sheets or formed parts 1 finished sheet or part, minimum
Laminate 1 or 2 sheets, as applicable of dimensions and description specified
for sample sheets in 4.4.3.1, where it is impractical to derive laminate test
specimens from the items to be furnished. Where practical, this may be
substituted by additional part or end item specimens sufficient to yield an
equivalent quantity of laminate suitable for testing. The provisions of 4.4.3 and
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