MIL-PRF-5425E
4.2.1 Qualification test sample. The qualification test sample shall consist of not less than
20 square feet (1.9 square meters) of plastic sheet for each thickness. Individual sheet dimensions
shall be not less than 12 by 36 inches (30 by 90 cm). To be qualified for all thicknesses,
manufacturers shall submit samples of plastic sheet with nominal thicknesses of 0.060, 0.125,
0.250, 0.500, 0.750, and 1.000 inch (1.5, 3.2, 6.4, 12.7, 19.0, and 25.4 mm). Qualification
samples for specific thicknesses may also be submitted.
4.2.1.1 Test specimens. Test specimens shall be prepared from a portion of the sheet sample
(see 4.2.1) to complete the tests specified for mechanical properties (see 4.5.6).
4.3 Conformance inspection.
4.3.1 Visual and dimensional inspection. Each lot (see 6.4) shall be sampled as specified
(see 6.2). Visual and dimensional defects shall be as specified in table V.
TABLE V. Visual and dimensional inspection.
INSPECTION
DEFECT
Appearance
Bubbles, striae, chips, or scratches.
Waves, distortion, irregularities, or other defects that would
render the sheet unfit for viewing objects through it.
Surfaces not made to a smooth or polished finish.
Embedded particles, such as grit or other foreign matter.
Ragged or rough edges or sides.
Color
Not colorless, or not color specified.
Protective covering
Not easily peeled. Surfaces marked when removed.
Varies by more than ±0.063 inch (1.6 mm) from length or width
Length and width
specified, unless greater tolerance permitted (see 6.2).
Thickness
Varies by more than the applicable tolerance specified in table I.
(For thickness of sheets not listed in table I, the tolerance for the
next larger thickness shall apply.)
4.3.2 Physical and mechanical inspection. Three samples shall be randomly selected from
each lot (see 6.4). Test specimens shall be prepared from each sample to complete the tests
specified in table VI.
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