MIL-PRF-46736E
figure 1 (see 6.2). Specified values of airflow are for
standard atmospheric conditions of 760 millimeters (mm)
of mercury barometric pressure and 27°C (80°F) ambient
temperature providing an air density of 1.17 kilogram per
cubic meter (kg/m3). Actual airflow values during testing
shall be corrected to standard conditions and shall be
within plus or minus two percent of specified values.
10 Seconds (typical)
P Measurement
Points
100
80
5 or 10 Minutes
60
Dust Loading
Interval As
40
Specified
20
0
15
25
0
5
20
30 (30 min. cycle, 5 min. intervals)
10
0
40
60 (60 min. cycle, 10 min. intervals)
10
30
50
20
Time (minutes)
FIGURE 1. Variable airflow cycle.
d. Airflow restriction
- Unless otherwise specified by the procuring activity,
actual airflow restriction values shall be corrected to
airflow with a density of 1.17 kg/m3 and shall be accurate
to + 0.025 kPa (0.1 in. of water).
e. Test dust
- The test dust shall be of two grades labeled fine and
coarse. The chemical analysis of test dust shall be as
specified in SAE J726. The particle size distribution by
volume and/or weight for the two grades shall be as
specified in SAE J726.
f. Dust feeding rate
- When the feeding of dust is required as part of any test,
the dust shall be fed at an average rate of 0.883 gram per
cubic meter (g/m3) (0.025 gram per cubic foot (g/ft3)) for
7
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