MIL-PRF-23419H
6.6.5 Bright alloy plated finish. Based on past experience, bright alloy plating .00008 inch (0.0020 mm)
thick for brass terminals and .0002 inch (0.0051 mm) thick for copper terminals with the following
compositions, has been used successfully to meet the performance requirements of this specification:
Copper -
50 to 60 percent
Tin
-
25 to 28 percent
Zinc
-
14 to 18 percent
6.7 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.
For additional information on this matter, refer to ASTM B545 (Standard Specification for
Electrodeposited Coatings of Tin).
6.8 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).
6.9 Subject term (key word) listing.
Amperes
Circuit protection
Continuity
Current-carrying capacity
Current limiting
2
Maximum current clearing (I t)
Overload interrupt
Overload protection
Short circuit
Time delay
6.10 Changes from previous issue. The margins of this specification are marked with vertical lines to
indicate where changes from the previous issue were made. This was done as a convenience only and
the Government assumes no liability whatsoever for any inaccuracies in these notations. Bidders and
contractors are cautioned to evaluate the requirements of this document based on the entire content
irrespective of the marginal notations and relationship to the last previous issue.
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