MIL-DTL-81736B(AS)
4.5.2.3.6.2 Case II. If one or both test specimens 2T and 3L fail the strength test, the
second and third production tapes are unsatisfactory. A 15-foot specimen shall be taken from the
trailing ends of the third and fourth production tapes. If one or both specimens fail the strength
test, the fourth production tape is unsatisfactory. The first production tape shall then be tested by
taking a 15-foot specimen from the leading end of the second production tape.
4.5.2.3.7 Test result VII. If all specimens fail, all tapes represented by that run fail.
4.5.2.3.8 Test result Sample plan E-Tape. If the raw tape sample fails, further testing as
specified in 4.5.2.3 shall be conducted.
4.5.2.3.9 Test result Sample plan E-Sewn loop. If the sewn loops taken from the finished
production lot fail, that production lot shall be destroyed.
4.5.3 Stiffness test. The stiffness test shall be conducted as shown on figure 4. A
deflection of one inch shall result when a test load of 75 +20 pounds, or 75 -10 pounds is
applied. Length of the as-woven specimen shall be 12 inches.
4.5.3.1 Test fixtures. The test fixture shall be provided by the tape supplier. The fixture
consists of three pieces of 2-inch bar stock, each at least 12 inches long of a suitable material,
mounted in a loading machine or device as shown on figure 4.
4.5.3.2 Test procedure. The tape specimen shall be installed with the woven edges, i.e., not
the cut ends, parallel to the center lines of the two lower bars and centered in the fixture. The
load shall be applied by means of the upper bar which is parallel to the lower bars and the load
and deflection recorded.
4.5.4 Extractable matter. The extractable matter, inclusive of the resin deposit, shall be
determined on one specimen of approximately 10 grams of the webbing. The sample, after
separation of the warp and filling yarns, shall be dried to constant weight in a weighting bottle at
a temperature of 220 ± 8 ºF. The specimen shall then be placed in a Soxhlet apparatus and after
a 6-hour extraction with methyl-ethyl-ketone, or suitable substitute. The final weight of the
extracted sample shall be obtained by repeating the constant weight drying conditions as
specified above. The percent of extractable matter shall be calculated as follows:
Loss in weight on extraction
Percent extractable matter
=
X 100
Original dry weight on sample
4.6.4 Classification of defects. Defects found during the examination shall be classified in
accordance with 4.6.4.1 and 4.6.4.2.
4.6.4.1 Yard-by-yard examination. A one-yard unit of tape as indicated in 4.3.4.1a shall be
examined and visual defects classified as listed in table IV. This examination may be performed
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