A-A-55126B
3. SALIENT CHARACTERISTICS
3.1 Tape material. The woven hook and loop fastener tapes shall be fabricated of synthetic
fibers and yarns. The Type III and IV, Class 4 hook fasteners shall be made using extruded nylon
resin. The Class 1 and 4 hook fastener tape shall be 100% nylon. The Class 2 hook fastener tape
shall be a blend of aramid and nylon fibers and yarns consisting of a nylon hook with an aramid
ground. The Class 1 loop fastener tape shall be 100% nylon and the Class 2 loop fastener tape
shall be 100% aramid. The Class 3 and Class 5 hook and loop fastener tapes shall be all 100%
polyester. All Class 4 and 5 tapes may be slit in widths ranging from 5/8 inches to 4 inches with
non-fraying edges. All selvages (including the 4 inch wide tape) shall not exceed 1/8 inch. The
tolerance for each width of woven tape (selvage or non selvage) shall be + 1/16 inch (including
selvage when applicable), except the 4 inch tape which shall be + 1/8 inch. Width tolerances for
the extruded tape shall be + 1/32 inch. Unless otherwise specified in the end item, tapes shall
exhibit the same edge finish on both sides of the tape, (both sides either have a selvage or both
sides do not have a selvage).
3.2 Construction.
3.2.1 Hook Fastener Tapes.
3.2.1.1 Construction of woven hook fastener tape (Type I and II, all Classes). The hook
fastener tape shall be a woven, warp loop, narrow fabric construction, with multifilament ground
ends (including selvages) and picks. Monofilament auxiliary warp ends shall be woven in the
form of raised loops which can be heat set to retain their shape and cut near the top of the loop in
order to form a free hook engaging section. The hook shall be a leno weave, woven in a staggered
order. The Type I hook fastener tape shall be made using a 6.5 mil, 200 denier hook, and the Type
II hook fastener tape shall be made using a 8.0 mil, 300 denier hook. The hook fastener tape shall
be visually examined for construction conformance and it shall conform to the requirements in
Table I and II when tested in accordance with the test methods in Table VII. One determination
per sample unit shall be made and the results reported as "pass" or "fail".
3.2.1.2 Construction of extruded hook fastener tape (Type III). The extruded hook fastener
tape shall be a continuous extrusion of plastic nylon resin. The Class 4 hook fastener tape shall
have fully formed hooks that are a minimum height of 0.025 inch with alternating rows and
containing a minimum of 375 hooks per square inch. The Class 4 hook fastener tape shall have an
average stiffness of no more than 0.07 inch pounds when tested as specified in Table VII. The
hook fastener tape shall be visually examined for construction conformance and it shall conform to
the requirements in Table I and II when tested in accordance with the test methods in Table VII.
3.2.1.3 Construction of extruded hook fastener tape (Type IV). The extruded hook fastener
tape shall be a continuous extrusion of plastic nylon resin. The Class 4 hook fastener tape shall
have fully formed hooks that are a minimum height of 0.035 inch with alternating rows and
containing a minimum of 375 hooks per square inch. The Class 4 hook fastener tape shall be
autoclave resistant. The hook fastener tape shall be visually examined for construction
conformance and it shall conform to the requirements in Table I and II when tested in accordance
with the test methods in Table VII.
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