MIL-DTL-24640C
3.3.5.3 Water-blocking filler materials (watertight). Water-blocking materials used in cable and shield
interstices shall be compatible with all other cable materials. The materials shall be clean, non-tacky to the touch,
and shall leave no residue on the installers' hands. The materials shall be free stripping from the cable components
and shield by hand and shall not require the use of chemicals or other mechanical means of removal. The materials
shall not interfere with any termination technique used with finished cable, shields, or components. The
3.3.5.4 Water-swelling fillers (watertight). Water-swelling fillers used to water-block cable voids and shield
interstices shall be compatible with all other cable materials in accordance with 4.7.2 and 4.7.3. The fillers shall be
clean and non-tacky to the touch. They shall be readily removable from the cable components and shields. The
fillers shall not interfere with any termination technique used with finished cable, shields, or components. Cables
manufactured with these types of fillers shall be tested for water-tightness with seawater in accordance with
ASTM D1141, and shall pass the limits for allowable water-leakage.
3.3.6 Tapes. Tapes shall be of a material compatible with the other cable materials in accordance with 4.7.2
and 4.7.3. Polyester tapes shall be Type G in accordance with MIL-I-631, and polyimide tapes shall be in
accordance with ASTM D5213. Tapes applied over shield braids for singles, twisted pairs, and triads, shall be
sealed or set to prevent unwinding freely, but shall be easily removable for wire and/or shield termination.
3.3.6.1 Water-swelling tapes (watertight). Water-swelling tapes used to water-block cable voids and shield
interstices shall be compatible with all other cable materials in accordance with 4.7.2 and 4.7.3. The tapes shall be
clean and non-tacky to the touch. They shall be readily removable from the cable components and shields. The
tapes shall not interfere with any termination technique used with finished cable, shields, or components. Cables,
manufactured with these types of tapes must be tested for water-tightness with seawater in accordance with ASTM
D1141, and shall pass the limits for allowable water-leakage.
3.3.7 Separators. Separators may be used at manufacturer's option where required to meet insulation
removability requirements and shall be of a material that is compatible with other cable materials. The compatibility
3.3.8 Binders. Binders shall be of a material compatible with the other cable materials. The compatibility of
the material shall be in accordance with 4.7.2.
3.3.9 Fungus resistance. All nonmetallic materials shall be fungus inert and shall be certified that they meet the
requirements of ASTM G21 with a growth rate of 1 or less.
3.3.10 Armor wires. The armor wires shall consist of Alclad 5056 or 5154 aluminum alloy having a diameter
of 0.0126±0.0005 inch with a minimum tensile strength of 50,000 pounds per square inch (lb/in2) and a minimum
elongation (before application to the cable) of 2 percent in 10-inch length.
3.3.11 Hazardous items and toxic materials. The material shall have no adverse effect on the health of
personnel when used for its intended purpose. Questions pertinent to this effect shall be referred by the contracting
activity to the appropriate departmental medical service who will act as an advisor to the contracting agency.
Regardless of any other requirements, materials and parts containing polyvinylchloride (PVC), asbestos, mercury, or
mercury compounds shall not be used.
3.3.12 Materials control. All materials included in the construction of the cable shall be examined and tested to
ensure conformance to this specification and applicable specification sheet. Once a cable construction has been
fully qualified, no materials may be added, deleted, or modified. Any addition, deletion, or modification of
materials within a cable construction or the processes used for cable construction shall require notification to
NAVSEA and possibly requalification.
3.3.13 Recycled, recovered, or environmentally preferable materials. Recycled, recovered, or environmentally
preferable materials should be used to the maximum extent possible, provided that the material meets or exceeds the
operational and maintenance requirements, and promotes economically advantageous life cycle costs.
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