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|  MIL-M-85831 (AS)
4.8.5 Environmental tests. Environmental tests shall be conducted in the
sequence specified in Table VI. Prior to and at the completion of each test
the mask shall be tested in accordance with the requirements of 4.8.2.1,
4.8.2.2, 4.8.2.3, 4.8.2.4, 4.8.2.5, 4.8.2.6, and 4.8.2.7 and shall meet the
requirement of 3.8.18.
4.8.5.1 High temperature. The high temperature test shall be performed as
specified in MIL-STD-810, method 501.2, Procedure II, Operation. The mask
shall be fitted to a dummy head and connected to a breathing simulator set at
a flow of 110 lpm at a rate of 44 cycles per minute. With the breathing
simulator off, the chamber temperature shall be raised to 158F at a rate of
5F per minute. The chamber temperature shall be maintained for one hour.
The relative humidity shall be not greater than 75 percent. The temperature
shall then be reduced to 131F at a rate of 5F per minute and maintained at
that temperature for a period of six hours. At the completion of the six hour
period the breather simulator shall be selected to the `ON' position. The
mask shall meet the requirements specified in 3.8.18 and 3.8.18.1.
4.8.5.2 Low temperature. The mask shall be subjected to the low
temperature test as specified In MIL-STD-81O Procedure II, Method 502.2,
Operation. The mask shall be fitted to a dummy head and connected to a
breathing simulator set at a flow of 110 1 pm at a rate of 44 cycles per
minute.
With the breathing simulator off, the chamber temperature shall be
lowered to -40F at a rate of 5F per minute.
The chamber temperature shall
be maintained for one hour. The temperature shall then be raised to -14F at
a rate of 5F per minute and maintained at that temperature for a period of
six hours. At the completion of the six hour period the breather simulator
shall be selected to the `ON' position. The mask shall meet the requirements
specified In 3.8.18 and 3.8.18.2.
4.8.5.3 Salt foq. The mask shall be tested as specified in MIL-STD-810,
Method 509.2. The mask shall be fitted to a dummy head and the air inlet hose
and microphone socket sealed. The mask shall be placed In the test chamber
and subjected to four alternating periods of 24 hour exposure and 24 hours
drying time. The mask shall be examined for corrosion and deterioration of
metal parts, finishes, materials and components. The mask shall meet the
requirements specified in 3.8.18 and 3.8.18.3.
4.8.5.4 Rain. The mask shall be subjected to the rain test as specified
in MIL-STD-81O, Method 506.2, Procedure I, Blowing Rain, for a period of one
hour at a rate of four inches per hour. The mask shall be fitted to a dummy
head and connected to a breathing simulator set at a flow of 3.9 cfm at a rate
of 44 cycles per minute. With the breathing simulator `ON' the mask shall
meet the requirements specified in 3.8.18 and 3.8.18.4.
4.8.5.5 Fungus. The mask shall be subjected to the fungus test as
specified in MIL-STD-810, Method 508.3, for a period of 28 days. The mask
shall be fitted to a dummy head. The mask shall meet the requirements
specified in 3.8.18 and 3.8.18.5.
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