MIL-DTL-5521C
4.5.2 Quality control tests. Quality control tests shall consist of all tests specified under 4.5.2.2.
4.5.2.1 Sampling instructions. The number of special butt bends and special backs to be sampled during
production of hydraulic packing back-up washers which are to be furnished under contract shall be as
follows:
No. of Butt Bends
No. to be
Sampled
or Backs Required
up to 20
1
21 to 100
2
over 100
2 percent
4.5.2.1.1 Specimens for physical tests. Specimens for physical tests shall be taken from the special butt
bend or special back before the ordered back-up washers are cut to the specified size. The specimen
shall be cut 3 inches (7.62 cm) wide beginning 1 inch (2.54 cm) from the backbone edge and 16 inches
(40.64) long beginning 15 inches (38.1 cm) from the root of the tail and running toward the shoulder end.
4.5.2.1.2 Specimens for chemical analysis. Specimens for chemical analysis shall be taken from units as
shown on Figure 1a and 1b and the following table:
Unit
Pieces
Special Back
ACJ
Special Butt Bend
ABJ
The pieces shall be approximately 2 inches (5.08 cm) by 4 inches (10.16 cm) and their relative location
on the hide shall be as follows:
a. Cut A with the bottom edge 10 inches (25.40 cm) from the root of the tail and the top edge 1 inch
(2.54 cm) from the line XZ
b. Cut B with the front edge 4 inches (10.16 cm) from front edge of special butt bend and top edge
1 inch (2.54 cm) from line XY.
c. Cut C with rear edge at a distance from the root of the tail equal to three-fourths of XZ and the
top edge 1 inch (2.54 cm) from line XZ.
d. Cut J equidistant from ends and with bottom edge 1 inch (2.54 cm) from line ST.
A portion of the leather shall be cut from each piece, the portions being approximately equal in weight.
The portions shall be ground in a Wiley mill so that all will pass through a .16 inch (4 millimeter (mm))
screen. The composite specimen shall be thoroughly mixed and stored in a tightly stopped bottle for
chemical tests outlined herein.
4.5.2.1.3 Specimens shall be in addition to the quantity specified in the contract or purchase order and
shall be furnished without additional cost to the government.
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