TM 5-818-8/AFJMAN 32-1030
Figure 1-2. Woven Monofilament Geotextiles Having Low Percent Open Area (Top), and High Percent Open Area (Bottom)
though it may be desirable to permit the thread to
must be tied at the end of each stitching. Two
be made of a material different from the geotextile
rows of stitches are preferred for field seaming,
being sewn. Sewing thread for geotextiles is usu-
and two rows of stitches are absolutely essential
ally made from Kevlar, polyester, polypropylene,
for secure seams when using the type 101 stitch
or nylon with the first two recommended despite
since, with this stitch, skipped stitches lead to
their greater expense. Where strong seams are
complete unraveling of the seam. Field sewing
required, Kevlar sewing thread provides very high
should be conducted so all stitching is exposed for
strength with relative ease of sewing.
inspection. Any skipped stitches should be over-
sewn.
1-7 Geotextile Functions and Applications.
d. Sewing Thread. The composition of the
a. Functions. Geotextiles perform one or more
thread should meet the same compositional perfor-
basic functions: filtration, drainage, separation,
mance requirements as the geotextile itself, al-
1-3
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