MIL-W-90490
4.4.4.1 Individual box. The pieces contained in each box in the sample shall be counted. A defect shall be considered to exist if the total quantity in the box is less than
98 pieces.
4.4.4.2 Total pieces in sample. The lot shall be unacceptable if the total of the pieces in the sample is less than the total number of pieces required in the boxes comprising the sample.
4.5 Methods of inspection
4.5.1 Loop strength. The test shall be made on a test apparatus that is described in method 4108 of FED-STD-191. The procedure shall be as follows: a. Prepare the specimen by cutting the solid weave webbing to produce tail length meeting dimensional requirement shown in figure 2. This can best be done by cutting the webbing with a hot knife or wire. b. Remove the front jaw clamps from the upper and lower jaws of the testing apparatus. c. Insert the specimen between the holding pin holes of the upper and lower front jaws. d. Insert through these holes and through the locking loop of the webbing a 1/8- by 3-inch steel pin (see figure 3). e. Test for loop strength with jaw separation speed of 12 inches per minute.
4.5.2 Resistant to heat. Five replicated tests shall be conducted from a 5-yard sample
unit of the webbing.0The tes0t spec0imen shall be suspended in a circulating air oven at a
temperature of 365
F (180
C + 3
C) for 1 hour. After removal from the oven, the
specimens shall be brought to equilibrium under standard conditions. They shall then be tested for breaking strength as specified in table III and the percent of breaking strength (B.S.) loss shall be calculated as follows:
Original B.S - B.S after aging x 100 = percent of B.S. loss
Original B.S.
4.5.3 Resistant to light. Five replicated tests shall be conducted from a 5-yard sample unit of the webbing. The test specimen shall be exposed in the accelerated weathering unit as specified in method 5804 of FED-STD-191. The specimens shall be placed
side by side on the rack in such a manner that only the center portion of each specimen is exposed. Corex D filters and sunshine carbons shall be used. The exposure time
shall be 50 hours. The spray heads shall be shut off during the entire exposure period. At the end of the exposure period, the specimens shall be brought to equilibrium under
standard conditions. They shall then be tested for breaking strength as specified in table II and the percent of breaking strength (B.S) loss shall be calculated as follows:
Original B.S - B.S after aging x 100 = percent of B.S. loss
Original B.S.
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