MIL-DTL-438C
4.5.2 Diameter. The diameter as specified in 3.3 shall be measured on the samples specified in 4.2.3
using standard measuring equipment that is accurate to within .0001 inch (.00254 mm). At least two
readings shall be taken 90 degrees apart at the same location on the diameter being measured. Each
sample shall have at least three measurements equally spaced over the entire length.
4.5.3 Breaking strength. Breaking strength as specified in 3.4 shall be determined using any standard
testing machine that applies the load at a constant rate of traverse or a machine calibrated in terms of a
constant rate of traverse shall be satisfactory. The capacity of the testing machine shall be such that all
specimens fail at a greater than 40% of the capacity of the machine. The clamps used shall be such that
there will be no slipping of, or damage to the test specimen. The testing machine shall have an accuracy
of least 5 grams when the clamp is traversing at a constant 12 inches per minute. The test specimen
shall be free of bends, kinks, or other imperfections. Tests where the test specimen breaks at a point less
than 0.5 inch from the clamp shall be disregarded.
4.5.4 Electrical resistance. Resistance values specified in 3.5 shall be checked using standard
measuring equipment, the accuracy of which shall be within 10 percent of the 30 to 80% scale range.
The measured resistance shall be the average reading of not less than five 12 inch samples.
5. PACKAGING
5.1 Packaging. For acquisition purposes, the packaging requirements shall be as specified in the
contract or order (see 6.2). When packaging of materiel is to be performed by DoD personnel or in-house
contractor personnel, these personnel need to contact the responsible packaging activity to ascertain
packaging requirements. Packaging requirements are maintained by the Inventory Control Point's
packaging activities within the Military Service or Defense Agency, or within the military service's system
commands. Packaging data retrieval is available from the managing Military Department's or Defense
Agency's automated packaging files, CD-ROM products, or by contacting the responsible packaging
activity.
6. NOTES
(This section contains information of a general or explanatory nature that may be helpful, but is not
mandatory.)
6.1 Intended use. The electrical wire covered by this specification is intended for use as the ignition or
bridge wire in electrical primers.
6.2 Acquisition requirements. Acquisition documents should specify the following:
a. Title, number and date of this specification.
b. Spool size, capacity, and approximate weight.
c. Place of inspection, test dates and tests.
6.3 Destroyed wire. All wire destroyed or consumed in conducting the tests required by this specification
should be in addition to the quantity of wire ordered and the cost thereof should be included in the
contract or order.
6.4 Environmentally preferable material. Environmentally preferable materials should be used to the
maximum extent possible to meet the requirements of this specification. As of the dating of this
document, the U.S. Environmental Protection Agency (EPA) is focusing efforts on reducing 31 priority
chemicals. The list of chemicals and additional information is available on their website
https://www.epa.gov/osw/hazard/wastemin/priority.htm. Included in the EPA list of 31 priority chemicals
are cadmium, lead, and mercury. Use of these materials should be minimized or eliminated unless
needed to meet the requirements specified herein (see section 3).
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