MIL-C-52009D
6.6 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).
6.7 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).
6.8 Subject (key word) listing.
Autotransformer
Splashproof
Spraytight
6.9 Changes from previous issue. Marginal notations are not used in this revision to identify changes
with respect to the previous issue due to the extent of the changes.
Custodians:
Preparing activity:
Army - CR4
DLA - CC
DLA - CC
(Project 6110-2012-001)
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 ASSIST Online database at https://assist.daps.dla.mil.
7
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