MIL-DTL-12285F
3.3.1 Dissimilar metals. Except where necessary to complete an electrical circuit, the switch shall be
designed and fabricated to minimize galvanic corrosion in dissimilar metal couples as specified in MIL-
3.3.2 Pure tin. The use of pure tin, as an underplate or final finish, is prohibited both internally and
externally. Tin content of switch components and solder shall not exceed 97 percent, by mass. Tin shall
be alloyed with a minimum of 3 percent lead, by mass (see 6.4.3)
3.3.3 Recycled, recovered, or environmentally preferable materials. Recycled, recovered, or
environmentally preferable materials should be used to the maximum extent possible, provided that the
material meets or exceeds the operational and maintenance requirements and promotes advantageous
life cycle cost.
3.4 Design and construction. Switches covered by this specification shall be in accordance with MIL-
3.4.1 Threaded parts. Screw threads, of the form, number per inch, and class specified on the
applicable drawing, military standard, or figure, shall be in accordance with the applicable sections of
FED-STD-H28 (see 4.7.1).
3.5 Performance.
3.5.1 Calibration. The switch shall operate within the temperature ranges specified in MIL-DTL-
12885/1 or MIL-DTL-12285/2 (see 4.7.3).
3.5.2 Dielectric withstanding. The switch shall operate within the temperature specified in 3.5.1 with
the insulation showing no evidence of cracking, charring, burning, smoking or other damage (see 4.7.4).
3.5.3 High temperature. The switch shall withstand being heated for one minute in an oil bath at 177º
± 3ºC (350º ± 5ºF), then cooled to room temperature, with the resultant change in calibration (see 3.5.1)
being no more than ± 3ºC (5.4ºF) (see 4.7.5).
3.5.4 Waterproofness. The switch shall withstand being submerged for 30 minutes while being
operated at full rated current and voltage, with no evidence of leakage. It shall subsequently meet the
3.5.5 Corrosion. The switch shall withstand being subjected to a salt spray (fog) condition for 200
hours with the resultant change in calibration (see 3.5.1) being no more than ± 3ºC (5.4ºF) (see 4.7.7).
3.5.6 Fungus. The switch shall operate as specified herein after exposure to 90 days of continuous
incubation (see 4.7.8).
3.5.7 Shock. The switch shall withstand shock impact of 100 gravity units (g) with no intermittent
contact, sticking of contacts or delay in functioning. The resultant change in calibration (see 3.5.1) shall
be no more than ± 3ºC (5.4ºF) (see 4.7.9).
3.5.8 Vibration. The switch shall withstand simple harmonic motion having an amplitude of 0.03 ± 10
percent ohms or 50g peak, whichever is less, along each of three mutually perpendicular axes with no
intermittent contact, sticking of contacts or delay in functioning. The resultant change in calibration (see
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