MIL-DTL-25879G
6.5 Subject term (key word) listing.
Antenna
Dissimilar metals
VSWR
Communication
Finish
Connector torque
Immersion
Coupling
Navigation
6.6 Finish.
6.6.1 Painted finish. Based on past experience, painted finish in accordance with MIL-DTL-14072, type II, has
been used successfully to meet the requirements of this specification.
6.6.2 Chemical conversion coating. Based on past experience, treatment of aluminum in accordance with MIL-
DTL-5541,class 3, has been used successfully to meet the requirements of this specification.
6.7 Workmanship.
6.7.1 Cleaning. After fabrication, parts and assembled equipment should be cleaned of smudges; loose,
spattered, or excess solder; weld metal; metal chips and mold release agents; or any other foreign material which
might detract from the intended operation, function, or appearance of the switch.
6.7.2 Threaded parts or devices. Screws, nuts, and bolts should show no evidence of cross threading, mutilation,
or detrimental or hazardous burrs, and should be firmly secured.
6.7.3 Wiring. Wires and cables should be positioned or protected to avoid contact with rough or irregular surfaces
and sharp edges and to avoid damage to conductors or adjacent parts.
6.7.4 Shielding. Shielding on wires and cables should be secured in a manner that will prevent it from contacting
or shorting exposed current-carrying parts. The ends of the shielding or braid should be secured to prevent fraying.
6.7.5 Containment. The harness and cable form containment means should be neat in appearance, uniformly
applied, and positioned to retain critical form factors and breakout locations. The containment means (lacing, ties, tie
down straps) should not cause the wire or cable insulation to deform so that performance characteristics are
adversely affected.
6.7.6 Insulation. There should be no evidence of burns, abrading, or pinch marks in the insulation that could cause
short circuits or leakage.
6.7.7 Clearance. The clearance between wires or cables and heat generating parts should be sufficient to
minimize deterioration of the wires or cables.
6.8 Tin whisker growth. The use of alloys with tin content greater than 97 percent, by mass, may exhibit tin
whisker growth problems after manufacture. Tin whiskers may occur anytime from a day to years after manufacture
and can develop under typical operating conditions, on products that use such materials. Conformal coatings applied
over top of a whisker-prone surface will not prevent the formation of tin whiskers. Alloys of 3 percent lead, by mass,
have shown to inhibit the growth of tin whiskers (see 3.1.2.4). For additional information on this matter, refer to
ASTM-B545 (Standard Specification for Electrodeposited Coatings of Tin).
6.9 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.
Environmentally Protection Agency (EPA) is focusing efforts on reducing 31 priority chemicals. The list of chemicals
and additional information is available on their website at https://www.epa.gov/osw/hazard/wastemin/priority.htm.
Included in the list of 31 priority chemicals are cadmium, lead, and mercury. Use of the materials on the list should
be minimized or eliminated unless needed to meet the requirements specified herein (see section 3).
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