MIL-DTL-28839B
6.6 Waveguide jacket material. Historically it has been proven that jacket material conforming to L-P-390, type III,
class H has satisfied the requirements of this specification.
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 3.3.4). For additional information on this matter, refer to ASTM-
B545 (Standard Specification for Electrodeposited Coatings of Tin).
6.8 Revision notations. The margins of this specification are marked with vertical lines to indicate modifications
generated by this revision. 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.
Custodian:
Preparing activity:
Army - CR
DLA - CC
Navy - EC
Air Force - 85
(Project 5985-2013-015)
DLA - CC
Review activities:
Army - MI
Navy - OS, SH
Air Force - 99
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.dla.mil/.
11
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