MIL-PRF-39002C
6.10 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).
6.11 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 https://www.epa.gov/osw/hazard/wastemin/priority.htm. Use of
these materials should be minimized or eliminated unless needed to meet the requirements specified herein (see
Section 3).
TABLE XII. Sequence for examinations, measurements, and tests.
Resistance
Dielectric
Independent
measured
withstanding
Setting
Insulation
Examination
Total
Peak
linearity
between
Torque
voltage (at
stability
resistance
or test
resistance
noise
tolerance
terminals
atmospheric
1,3
pressure)
Group I
Visual and mechanical
A
Examination
Actual effective-electrical
A
A
A
A
Travel
Absolute minimum
Atmospheric
resistance
and
Barometric
End resistance
Continuity Thermal
B, A
B, A
A
shock
Group II
Resistance-temperature
characteristic
Moisture resistance
B, A
A
A
Group III
Acceleration
B, A
B, A
A
Shock, specified pulse
B, A
B, A
Vibration, high frequency
B, A
A
A
B, A
A
Salt spray (corrosion)
Group IV
Resistance to soldering
B, A
heat
Life
B, A
A
A
A
A
B, D, A
B, A
A
Group V
Low temperature
B, A
B, A
B, A
operation
High temperature
A
A
A
A
B, A
A
exposure
Group VI
Rotational life
B, A
A
A
Terminal strength
B = Before test, D = During test, A = After test
24
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