MIL-DTL-45144E
3.5.3. Cotton yarn construction. Cotton yarn used in the manufacture of the fuse shall be
natural, unfinished yarn spun from thoroughly clean, staple carded cotton fiber.
3.5.4. Cotton yarn imperfections. The cotton shall be evenly drawn, spun, and twisted into a
smooth and even yarn, free from any lumps, lint, or other imperfections which would adversely
affect the finished fuse.
3.5.5. Cotton yarn number. Yarn number shall be as specified herein for the particular use
and shall be taken as the number of 840 yard hanks per pound.
3.5.6. Cotton yarn skein breaking strength. The breaking strength of the yarn shall not be less
than the standard obtained as follows, when tested in skeins equivalent to 120 yards of single end:
Standard Breaking Strength = (1800 divided by the yarn number) plus (the # of plies multiplied by 3).
3.5.7. Cotton yarn single strand breaking strength. The breaking strength of single strands in
ounces shall be not less than 12.5 percent of the standard breaking strength in pounds.
3.6. Jute yarn. The jute yarn spinning shall be applied on top of the fuse powder train of 3.3
and 3.4.
3.6.1. Jute yarn spinning. The spinning shall consist of a tight spiral wrap of 10 jute yarns
applied with a right hand or S twist. The wrap shall completely enclose the fuse powder train.
3.6.2. Jute yarn construction. The yarn shall be batched with a single application containing
an emulsion of water, mineral oil, and a suitable emulsifying agent, which will not adversely affect
the finished yarn. The yarn shall be otherwise untreated and shall have a natural color.
3.6.3. Jute yarn imperfections. All jute yarns shall be essentially level and free from bark,
rove, large and loose knots, slubs, and excess of root fibers. The allowable imperfections must pass
through a cleaner to remove all foreign material larger than 0.051 inch diameter.
3.6.4. Jute yarn number. The yarn shall be number 14.5 plus or minus 20%. The average
yarn number of the spinning jute yarns shall range from 13.77 to 15.23. Yarn number shall be taken
as 496 yard hanks per pound.
3.6.5. Jute yarn breaking strength. The single yarn breaking strength shall be not less than 9.7
pounds.
3.6.6. Jute yarn twist. The yarn shall be spun with a Z twist, also known as left hand twist.
3.6.7. Jute turns per inch. The average number of turns per inch (tpi) shall be 3.36 tpi plus or
minus 10 percent.
3.6.8. Jute yarn oil content. Oil (natural or other) content of the yarn shall be not greater than
one percent by weight.
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