MIL-PRF-26H
6.11 Soldering. A solder with a minimum melting temperature of 350OC should be used in soldering characteristic
V resistors.
6.12 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).
6.13 Caution. Certain coating materials used in fabricating resistors to this specification may be subjected to
"outgassing" of volatile material when operated at surface temperatures over 200OC. This phenomena should be
taken into consideration for equipment design.
6.14 Subject term (key word) listing.
Axial leaded
Ferrule terminal
Flat tab terminal
Tubular tab terminal
6.15 Environmentally preferable material. Environmentally preferable materials should be used to the maximum
extent possible to meet the requirements of this specification. Table XVIII lists the Environmental Protection Agency
(EPA) top seventeen hazardous materials targeted for major usage reduction. Use of these materials should be
minimized or eliminated unless needed to meet the requirements specified herein (see section 3).
TABLE XVIII. EPA top seventeen hazardous materials.
Benzene
Dichloromethane
Tetrachloroethylene
Cadmium and Compounds
Lead and Compounds
Toluene
Carbon Tetrachloride
Mercury and Compounds
1,1,1 - Trichoroethane
Chloroform
Methyl Ethyl Ketone
Trichloroethylene
Chromium and Compounds
Methyl Isobutyl Ketone
Xylenes
Cyanide and Compounds
Nickel and Compounds
6.16 Changes from previous issue. The margins of this specification are marked with vertical lines to indicate
where changes from the previous issue were made. 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 and
relationship to the last previous issue.
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