MIL-DTL-15291G
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. Environmental 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 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).
6.9 Sub-contracted material and parts. The packaging or preparation for delivery requirements of
referenced documents listed in section 2 do not apply when material and parts are acquired by the
contractor for incorporation into the equipment and lose their separate identity when the equipment is
shipped.
6.10 Lubricating Compounds. It is recommended that MIL-PRF-23827 be considered for meeting the
lubricating compound requirements of this specification.
6.11 Plastic laminates. It is recommended that MIL-I-24768, type FBE be considered for the plastic
laminates material.
6.12 Plastic molding. It is recommended that ASTM D5948, type MAI-60 or MAI-30 be considered for
the plastic molding material.
6.13 Moving contact material. It is recommended that phosphor bronze in accordance with ASTM-
B139be considered for the moving contact material.
6.14 Stationary contact material. It is recommended that copper in accordance with ASTM-B152 be
considered for the stationary material.
6.15 Contact studs. It is recommended that copper in accordance with ASTM-B133 and ASTM-B272
be considered for the contact studs material.
6.16 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).
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