combiners. Specific requirements tailored for ┬ôspace flight application┬ö components are included to represent the highest reliability components specified herein. Such components are intended for use in NASA manned, satellite, interplanetary or launch vehicle programs.

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MIL-DTL-23971D

6.6 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).

6.7 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 (see 3.4.10.3). For additional information on this matter, refer to

ASTM-B545 (Standard Specification for Electrodeposited Coatings of Tin).

Custodians:

Preparing activity:

Army - CR

DLA - CC

Navy - EC

Air Force - 85

(Project 5985-2012-009)

DLA - CC

NOTE: The activities listed above were interested in this document as of the date of this document. Since

organizations and responsibilities can change, you should verify the currency of the information above using the