MIL-DTL-27500H
4.2.2.1 Sampling for process control tests.
4.2.2.1.1 Shield strand material. From each week's production of individual shield strands or from every 100 pounds of
individual shield strand, whichever is less, three 10-foot lengths of each style of shield strand representative of the material to be
used in the finished cable shall be selected.
4.2.2.1.2 Coating. A sample shall consist of at least 3.5 feet of strand, before braiding, that is representative of the strand to be
used in each lot of finished cable (see 4.2.1.1).
4.2.2.1.3 Coated copper strand elongation. A sample shall consist of at least 3.5 feet of strand, before braiding, that is
representative of the strand to be used in each lot of finished cable (see 4.2.1.1).
4.2.2.1.4 Basic wire. Sampling of the basic wire shall be in accordance with the sampling plan of the basic wire specification.
Additional impulse dielectric testing in accordance with the basic wire specification shall be performed when potentially degrading
operation, either thermal, mechanical, or chemical have been performed subsequent to the original test.
4.2.3 Rejection and retest. When the sample selected from a production run fails to meet the specified tests, no items still on
hand or later produced shall be accepted until the extent and cause of failure have been determined. After investigation, the
contractor shall advise the acquiring activity of the action taken and after corrections have been made, all process control tests shall
be repeated.
4.2.3.1 Tests may continue. For production reasons, testing may be continued pending the investigation of the process control
sample failure but final acceptance requirements of the material shall not be made until it is determined that the lot meets all the
requirements of the specification.
4.3 Methods of inspection.
4.3.1 Inspection of product. All samples of cable shall be carefully inspected for all requirements of this specification not
covered by tests to ascertain conformance to this specification.
4.3.1 Shield strands.
4.3.2.1 Elongation. Elongation tests on the coated copper strand shall be conducted in accordance with
MIL-STD-2223 , method 5002 , using a 12-inch specimen, 10-inch bench marks, and a 10-inch initial jaw separation. The test shall
be run on 3 specimens.
4.3.2.2 Coating.
4.3.2.2.1 Thickness. The thickness of the coating shall be determined by the electronic determination method of ASTM B298 or
ASTM B355.
4.3.2.2.2 Continuity of tin, silver, and nickel coating. Continuity of tin, silver, and nickel coating tests shall be conducted in
accordance with ASTM B 33, ASTM B 298, or ASTM B 355, as applicable. There shall be no evidence of exposed copper.
4.3.3 Dielectric withstand.
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