MIL-PRF-19207G
6.5.2 Finish, solder-lug terminals,and non-mating surfaces. It is recommended that the following
finishes be considered for meeting the performance requirements of this specification:
a. Nickel plating with a minimum thickness of .0002 inch (0.005 mm).
b. Bright alloy plating with a minimum thickness of .0002 inch (0.005 mm) and the following
composition:
Copper -
50 to 60 percent
Tin
-
25 to 28 percent
Zinc
-
14 to 18 percent
c. Tin lead plating in accordance with SAE-AMS-P-81728.
d. Hot-solder dip (60-40 tin lead) in accordance with IPC J-STD-006.
6.5.3 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).
6.6 Body molding. Based on past experience, type MAI-60, SDG-F or GDI-30F of ASTM D5948 has
been used successfully, for meeting the body and carrier molding material requirements of this
specification. Optional body molding materials are acceptable as long as they enable fuseholders to
meet the performance requirements of this specification.
6.7 Caps. Based on past experience, ASTM D3935 has been used successfully as guidance in the
use of this material.
6.8 Indicator lamps.
6.8.1 Glow lamps. It is suggested, based on past experience, that industry type A9A or equal be
considered for use in characteristic L fuseholders, to meet the performance requirements specified
herein.
6.8.2 Incandescent lamps. It is suggested, based on past experience, that industry number 1764, or
equivalent, be used in characteristic L fuseholders where the fuseholder rating is less than 90 volts (V). It
is also suggested that incandescent lamps which are captive within the fuseholder cap assembly be
cemented or encapsulated in place.
6.9 Mounting hardware. It is recommended that ASTM B633 be used for guidance on plating.
ASTM B633, type II, class Fe/Zn12 plating has been used successfully in the past.
6.10 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).
6.11 Types FHL10U and FHL29G. The types FHL10U and FHL29G fuseholders are dual fuseholders
which may be mounted tandem with types FHL11U or FHL30G fuseholders respectively, for banks of
fuseholders requiring an odd number of fuse carriers.
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