MIL-C-46409D (AR)
APPENDIX "H"
WATERPROOF TEST PROCEDURE
10.0 PURPOSE
To determine the water tightness of cartridges.
20.0 EQUIPMENT
The equipment shall be the equivalent of that shown on drawing listed in the Waterproof
section of the appropriate Inspection Equipment List.
30.0 TEST PROCEDURES
30.1 Preparation for test.
30.1.1 Convenient configuration for the reservoir and glass test chamber are shown on the
drawing referenced in 20.0. the glass test chamber should be at least of sufficient diameter to
accommodate five cartridges lying horizontally on a perforated rack or tray and of sufficient
depth to allow at least two inches of water above the cartridges for the test. The volume of the
reservoir should be about five to fifteen time the volume of air remaining in the glass test
chamber when the desiccator contains sufficient water for conducting the test.
30.1.2 The glass test chamber shall contain a sufficient amount of freshly boiled water
(cooled at room temperature) to allow 2 to 2-1/2 inch head of water above the cartridge. A
perforated metal tray shall be placed across the narrow part of the body. The ground glass
surfaces on the lid and body and on the glass top shall be smeared with vaseline or vacuum
grease.
30.2 Conducting the test.
3.2.1 With the glass test chamber closed to the vacuum reservoir and the valve open from
the reservoir to the vacuum pump, the vacuum pump shall be set in operation. The pressure in
the reservoir shall be reduced until the vacuum gage shows some predetermined reading greater
than that specified in the specification; this predetermined reading is the vacuum in the reservoir
which will, when the reservoir is connected to the glass test chamber, produce the desired
vacuum in both. (The desired vacuum in the reservoir will be approximately one to three inches
greater than that required by the specification and should be determined by experiment with the
particular apparatus to be used, and recoded for future reference). When the desired vacuum in
the reservoir has been obtained, the valve from the reservoir to the vacuum pump shall be closed,
and the pump operation may be stopped.
30.2.2 The ammunition to be tested (not exceeding the number specified) shall be placed
horizontally on the tray in the glass test chamber and the lid placed in position. The glass tap
shall be turned to allow the vacuum resevoir to evacuate the glass test chamber to the
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