MIL-DTL-82646B (OS)
4.3.1.1 Lot. A lot shall consist of 50,000 yd2 (41,800 m2)of material or less, manufactured by the same
process, from the same components, by one manufacturer, at one plant and offered for delivery at one
time.
4.3.1.2 Sampling for examination Samples for examination shall be selected in accordance with
inspection level II, single sampling, normal inspection of ASQ Z1.4. Sufficient material shall be selected
at random so that the required sample yardage is obtained.
4.3.1.3 Sampling for tests. For the purpose of maintaining continuous inspections, test samples shall be
taken from material packed for shipment. The lot (4.3.1.1) shall be divided into five equal segments.
Five sample rolls shall be drawn from the lot for test, one from each of the five equal segments. Each test
sample consisting of 6.0 yd2 (5.0 m2) shall be assigned a number from one to five in order of manufacture.
4.4 Periodic production inspection. When specified in the contract or order (see 6.2). periodic production
samples shall be forwarded to an activity specified by the procuring activity (see 6.2) for periodic
production inspection.
4.4.1 Periodic production samples. Periodic production samples shall be selected from plastic film that
has passed the quality conformance inspection of 4.3. The sampling plan shall be as specified by the
procuring activity (see 6.2).
4.5 Examinations. Sample material shall be visually inspected to verify conformance with this
specification. Defect classification shall be in accordance with Table II.
TABLE II. Types of defects.
Examination
Defects
Form
Rolled or flat cut not as specified, lay flat dimensions or film thickness not as specified
Cleanness
Not clean
Workmanship
Embrittlement or any hole, tear, cuts, chafed spot, or other defect that would impair usefulness of film
Construction
Not uniform; pinholes, cracks, blisters, scratches, mottling, folds, foreign matters, gels, or fish eyes
Color
Not uniform
Identification
Marking not as specified. Identification sheet missing.
4.5.1 Examination for roll or package defects. The lot size for this examination shall be expressed in units
or packages of sheets.
4.5.2 Examination for appearance and workmanship. The lot size for this examination shall be expressed
in units of square yards of film. Defects shall be scored only once for each occurrence within a square
yard.
4.6 Tests. Film samples shall be subjected to the following tests. Failure of any sample to pass any test
shall be cause for rejection of the lot.
4.6.1 Test condition. Prior to testing, film samples shall be conditioned for 24 hours minimum in a
moving atmosphere having a relative humidity of 50 ± 5 percent and n temperature of 21º to 24.5 ºC (70º
to 76 º'F).
4.6.2 Chemical compatibility. The film shall be tested for compatibility with the chemicals listed in 3.4.1.
The test procedure shall be in accordance with Method 7081 of FED-STD-206, with the following
exceptions:
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