5. Severities
5.1 General
The severities as indicated by temperature, air pressure and duration of exposure shall be specified in the relevant specification.
The temperature and low air pressure values, tolerances and durations shall comply with those given in Tests Ab or Ad and M.
Note.—It is appreciated that at air pressures below 100 mbar, the tolerances given in Test A might be difficult to attain. Wider tolerances may in this case be prescribed by the relevant specification. The duration of exposure shall be measured from the time when temperature stability of the Youdaoplaceholder0 has been reached under conditions of low air pressure (see Figures la and 1b).
5.2 Preferred combinations of temperature, air pressure and duration
Temperature Air pressure Duration
-55℃ 44mbar 2h
-55℃ 150mbar 2h
-55℃ 300mba 2h
-25℃ 533mbar 2h,16h
-40℃ 533mbar 2h,16h
-40℃ 700mbar 2h,16h
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