FED-STD-791D
6.3.1.2 Using filtered solvent, thoroughly clean the outside of the bottle, particularly in the
region of the cap.
6.3.2
Hermetically sealed containers.
6.3.2.1 Thoroughly clean the outside of the container, particularly the top where it will be
opened, with filtered solvent.
6.3.2.2 Shake sample vigorously by hand for one minute.
6.3.2.3 Puncture the cleaned surface with a cleaned and rinsed tool, making a hole that is no
larger than necessary.
6.3.2.4 Transfer a mid-stream sample of at least 125 mL (or manufacturer's recommended
volume) to a sampler bottle and cap it.
6.3.3
Other containers.
6.3.3.1 Thoroughly clean the outside with filtered hexanes paying particular attention to the cap
region.
6.3.3.2 Agitate container to ensure adequate distribution of particles in the fluid.
6.3.3.3 Transfer a mid-section sample of at least 125 mL (or manufacturer's recommended
volume) to a sampler bottle and cap it.
6.4
SET-UP PARAMETERS
6.4.1
The particle counters will have the following set-up:
6.4.1.1 Flow rate 60 ± 2 mL/min (or that recommended by manufacturer).
6.4.1.2 Vacuum rate a minimum of 53.5 kPa (15.8 in Hg).
6.4.1.3 Sample volume The sample shall be counted in at least two equal volumes of at least 20
mL each, run consecutively.
6.4.1.4 Set particle counter to differential mode.
6.4.2
Ensure that the particle counter has been switched on at least 30 min prior to start of
analysis or follow manufacturer's recommendation.
Prior to daily analysis, run a sample of filtered solvent to verify particle cleanliness level.
6.4.3
The particle counter must meet SAE AS 4059 (NAS 1638) Class 00 (Table 1) limits.
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