MIL-PRF-121G
4.3.2 Examination of the end item. For the purpose of determining the sample size in
accordance with ASQC-Z1.4, the lot size (see 6.5) shall be expressed in units of rolls for
examinations specified in 4.3.2.1.
4.3.2.1 Examination of the end item for construction, form, identification, sealing, and
workmanship. The sample unit for the end item inspection shall be one roll. The sample unit
shall be visually inspected and measured to ensure it meets the requirements specified in 3.3
through 3.7.
4.4 Test conditions. Unless otherwise specified in the test methods herein, the physical
tests contained in this specification shall be conducted in an atmosphere having a relative
humidity (RH) of 50 ± 5 percent and at a room temperature that shall have a range from
70 to 76 °F. Material shall be considered in equilibrium after exposure to the above conditions
for a minimum of 24 hours.
4.5 Sealing instructions for first article and conformance testing.
a. All seals for test purposes shall be not less than 1/2-inch wide and shall be effected on a
jaw-type heat-sealer (or equivalent as approved by the approving activity) utilizing the sealing
conditions recommended by the manufacturer. The upper sealing conditions for production line
sealing operations with respect to commercially available sealing equipment and commercially
practicable fabrication time are a temperature setting of 525 °F, a 3-second dwell time, and a
pressure of 60 pounds per square inch (see 6.3).
b. In securing the three 1-inch seam strength specimens from their respective samples
(see 4.6.2.2.1), specimens shall not be removed:
(1) From points in the sealed sample where seal overlapping has occurred.
(2) From points in the sealed sample that are within 1 inch of either end
of the sealer jaw during the sealing operation.
4.6 Verification of performance requirements.
4.6.1 Test methods. Unless otherwise specified, the tests in table III shall be conducted in
accordance with the identified test methods.
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