MIL-DTL-13625F
4.5.7.3 Waterproofness. To determine conformance to 3.5.3, grade 1 switches shall be subjected to
the waterproofness test of 4.5.7.3.1 and grade 2 switches shall be subjected to the test of 4.5.7.3.2
4.5.7.3.1 Grade 1 switches.
a. The switch assembly shall be installed in a test circuit equivalent to the assemblies' normal dry
environment. The assembly shall then be operated both electrically and mechanically for a
period of 30 minutes at full rated current and voltage with the results recorded.
b. The switch assembly shall then be submerged in a container with the uppermost surface a
minimum of one inch below the surface of a saline solution consisting of 5 parts by weight of salt
in 95 parts by weight of distilled water that will be kept free of sediment by filtration or
decantation. The switch assembly shall be installed in the chamber and carefully observed
during its entire period of submersion and operated for 30 minutes at full rated current and
voltage. The chamber shall then be evacuated to a pressure of six pounds below atmospheric so
as to apply a minimum of six pounds per square inch (psi) internal pressure to all voids within the
switch assembly. The test results per square inch (psi) internal pressure to all voids within the
switch assembly. The test results obtained shall be compared with the data obtained in
4.5.7.3.1a. During this period the switch assembly shall be carefully observed for poor seals, as
evidenced by leakage defined by bubbles escaping from the interior of the switch assembly when
the chamber is evacuated as previously specified.
c. The chamber shall then be pressurized to six pounds above atmospheric. Then the switch
assembly shall again be operated for 30 minutes with the results recorded. The recorded results
shall be compared to the data obtained from 4.5.7.3.1a.
4.5.7.3.2 Grade 2 switches.
a. The switch assembly shall be installed in a test circuit equivalent to the assemblies' normal dry
environment. The assembly shall then be operated both electrically and mechanically for a
period of 30 minutes at full rated current and voltage with the results recorded.
b. The switch assembly shall then be submerged in a container with the uppermost surface a
minimum of one inch below the surface of a saline solution consisting of 5 parts by weight of salt
in 95 parts by weight of distilled water that will be kept free of sediment by filtration or
decantation, at room ambient temperature (77° + 15°F) for a period of one hour. The switch shall
then be removed from the solution and allowed to drain for a period of five minutes in its normal
operating position. It shall then be subjected to 15 hours of dry operation (three 5-hour periods) at
full rated current and voltage and results obtained compared with pre-submergence data obtained
under 4.5.7.3.2a.
4.5.7.4 Extreme temperature. To determine conformance to 3.5.4, the switch shall be connected to the
4.5.7.4.1 Low temperature operation. The switch shall be conditioned for 24 hours at -60F 5F. If
the switch is type I or IV, arrangement 1 or 2, it shall be in normal position during conditioning. If the
switch is type V, the switch shall be in "off" position during conditioning. If the switch is type V, the switch
shall be in "off" position during conditioning. After conditioning and while in ambient air at the above
temperature, the force specified in 3.5.4 shall be applied to the actuating area or handle of the switch.
The switch shall then be operated for 1,000 cycles in accordance with the applicable requirements of
4.5.4 or 4.5.5.
4.5.7.4.2 High temperature operation. The switch shall be conditioned for 24 hours at 160F 5F.
While still in ambient air at that temperature, the switch shall be operated for 1,000 cycles in accordance
with the applicable requirements of 4.5.4 and 4.5.5.
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