MIL-DTL-24671C(SH)
3.1.7 Solvent compatibility. The fabric shall not discolor or show visible degradation
when immersed in each of the following solvents for a period of 60 minutes at ambient
temperature:
(a)
Acetone
(b)
Isopropyl alcohol
(c)
Trichloroethylene
(d)
Dry cleaning solvent (stoddard solvent) in accordance with
MIL-PRF-680
(e)
Nonionic detergent in accordance with MIL-D-16791 (one fluid ounce in one
gallon of tap water) combined with trisodium phosphate detergent solution
(approximately 23 ounces to every one gallon of total detergent solution)
3.1.8 pH. The pH value of the water extract of the fabric shall be no less than 6.0 and no
more than 8.0 when tested as specified (see 4.2).
3.1.9 Nonfibrous materials. The fabric shall not exceed 2.0 percent starch and protein
content including chloroform-soluble and water-soluble material when tested as specified (see
4.2).
3.1.10 Absorbency. The fabric shall be considered absorbent when water and oil are
absorbed into the fabric within 30 seconds, when tested as specified (see 4.4).
3.1.11 Leachable chemicals. The cloth shall contain no more than 250 parts per million
(ppm) (micrograms per gram) of water leachable sulfur or 250 ppm (micrograms per gram) each
of water leachable halides (fluoride, chloride, and bromide), when tested as specified (see 4.2).
3.1.12 Mercury. The fabric used to manufacture lint-free cloths shall not contain mercury
and shall not be contaminated by mercury or mercury compounds during manufacturing of
cloths.
3.2 Design and construction.
3.2.1 Dimensions. Unless otherwise specified (see 6.2), the cloth dimensions shall be
Class A or B.
3.2.2 Edge stitching. The outer periphery of the cloth shall be hem stitched with a three-
thread tight needle thread overseam of 18 + 1 stitches per inch. The thread shall be of
polyester or hard finished cotton. Hem stitches shall be ended in such a manner so as to
preclude the possibility of threads unraveling at these areas on the cloth. Any hanging threads
shall be trimmed to a length of 1/16 inch or less. Grade 1 cloths shall use white thread for edge
stitching. Grade 2 cloths shall use dark blue thread for edge stitching.
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