MIL-DTL-24640C
4.7.2.6 Further observation. Specimen failure shall be construed if the specimen, upon dissection and
inspection, exhibits visible deterioration of such a nature or extent as to impair the performance of the cable in
service. Deterioration sufficient to constitute specimen failure shall include, but not limited to, distortion or
cracking of any constituent component, hardening of sealant material, or any discoloration indicating material
incompatibility.
4.7.3 Cable sealant removability. This test shall determine whether or not sealant materials can be readily
removed from the constituent components of cable. This test shall not apply to sealant material used to fill voids
between either conductor strands or braid strands.
4.7.3.1 Specimen. The specimen shall be a 2-foot length of completed cable.
4.7.3.2 Procedure. Overall specimen components (such as jackets, overall binders, or shields) shall be removed
from one end of the specimen for a distance of not less than 10 inches, thereby exposing the cable core. Using
fingers only, sealant material shall then be removed from all exposed insulated conductors or from all groupings of
insulated conductors which have a common covering (such as insulated conductor pairs or triads, which have an
overall shield or binder) for a distance of not less than 8 inches. Tools, cloths, or solvents shall not be used to assist
with sealant removal. The common covering and sealant material shall then be removed from not less than one
grouping of insulated conductors, on specimens incorporating such groupings, for distance of not less than 5 inches.
Fingers only shall then be used for sealant removal. If occasional particles of sealant material remain on any
constituent component of the cable core, then the removal of these particles shall be attempted by means of light
brushing with fingers or with a dry cloth.
4.7.3.3 Observation. Any of the following shall constitute specimen failure:
a.
Sealant material is nonflexible.
b. Sealant material which adheres to the finger or to any component of the cable core. The adherence of
occasional small particles of sealant material to the cable core is acceptable unless there are small particles which
cannot be removed from the core components by light brushing with fingers or a dry cloth.
c.
Sealant material which leaves a residue on cable core components.
d.
Sealant material cannot be removed in less than 5 minutes.
4.7.4 Cold bending cable. This test shall determine the ability of completed cable, which is not intended to be
flexed during use, to withstand bending at reduced temperature, such as might be encountered during shipboard
construction or repair.
4.7.4.1 Specimen. The specimen shall consist of a piece of completed cable which shall have a length of not
less than the sum of 12 inches +1.6 times the specified mandrel diameter (see 3.1).
4.7.4.2 Special apparatus. Apparatus shall include the following:
a. Refrigeration chamber shall support the requirements as specified in 4.7.4.3. The chamber air temperature
shall be measured in the immediate vicinity of the specimen.
b. Mandrel shall be rigid, smooth cylinder or partial cylinder, with a continuous, curved surface of not less
than 180 degrees, of suitable length and construction for the specimen bending of 4.7.4.3. Unless otherwise
specified (see 3.1), the mandrel diameter shall be 12 times the diameter of the cable. The mandrel shall be provided
with a clip for affixing one specimen end (see 4.7.4.3).
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