MIL-PRF-131K
TABLE V. Examination of the end item for dimensional defects.
EXAMINATION
DEFECT
Length or width varies by more than plus ¼ inch or minus 1/8 inch
Sheets
from dimensions specified.
Rolls:
Varies by more than plus ¼ inch or minus 1/8 inch from width
Width
specified.
Average length of roll material is less than 200 yards, length of any
Length
individual roll is less than 195 yards.
Length is less than width of roll material, or greater by more than
Core
plus 1/8 inch. Inside diameter less than 3 inches or greater than
3 1/8 inches.
Lettering is less than 1/8 inch in height.
Identification
markings
More than 2 inches distance between lengthwise group of
markings.
The complete group does not appear once in each 18 inches of
width of roll.
4.4 Test conditions. Unless otherwise specified in the detail test methods herein, the
physical tests contained in this specification shall be made with an atmosphere having a relative
humidity of 50 ± 5 percent and a temperature ranging from 73 ± 3 °F. Material shall be
considered in equilibrium after exposure to the above conditions for a minimum of 24 hours.
4.5 Sealing instructions for qualification and conformance testing.
a. All seals for test purposes shall be not less than ½-inch wide and shall be effected on a
jaw-type heat-sealer (or equivalent as approved by the qualifying activity) utilizing the sealing
conditions recommended by the manufacturer. These conditions shall be limited as follows
(see 6.3):
(1) Maximum temperature = 500 °F
(2) Maximum dwell time = 3 seconds
(3) Maximum pressure = 60 lbs/sq. in.
b. In the securing of the three 1-inch seam strength specimens from their respective
samples, 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 were within 1-inch of either end
of the sealer jaw during the sealing operation.
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