D7321_10 V4
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For fuels containing little
particulate materials,
only one filter is required,
as a control filter is not
required.
If the fuel is
highly contaminated,
more than one filter
may be required.
See section 11 of
the written standard.
Clean all glassware used in
preparation of glass fiber
filter as described in section
9 of the written standard.
Using forceps, place the glass
fiber filter in a clean Petri
dish to facilitate handling.
The glass fiber filter should
rest on clean glass support
rods or watch glasses
in the Petri dish.
Place the Petri dish
with its lid slightly
ajar in a drying oven
at 90 degrees Celsius,
plus or minus 5 degrees Celsius,
and leave it for 30 minutes.
Remove the Petri dish
from the drying oven
and place it near the balance.
Keep the Petri dish
cover ajar, but such
that the filter is still
protected from contamination
from the atmosphere.
Allow 30 minutes for
the filter to come
to equilibrium with room air
temperature and humidity.
Remove the control glass fiber
filter from the Petri dish
with forceps, handling
by the edge only,
and place it centrally on the
weighing pan of the balance.
Weigh it.
Record the initial mass to
the nearest 0.0001 gram,
and return it to the Petri dish.
Place the filter
on the funnel base.
And then install the
funnel and secure
with locking ring
or spring clip.
Do not remove the plastic
film from the funnel opening
until ready to start filtration.