MIL-DTL-5624V
APPENDIX A
h. Record the vacuum in kPa (in. of mercury) as determined from the average of the two
readings taken in A.6.1.f.
i. After recording the filtration time, shut off the vacuum and rinse the sample container
with approximately 100 mL of filtered petroleum ether and dispense into the filtration funnel.
Turn on the vacuum and filter the 100 mL rinse. Turn off the vacuum and wash the inside of the
funnel with approximately 50 mL of filtered petroleum ether. Turn on the vacuum and filter.
Repeat the funnel rinse with another 50 mL of petroleum ether but allow the rinse to soak the
filter for approximately 30 seconds before turning on the vacuum to filter the rinse. With the
vacuum on, carefully remove the top funnel and rinse the periphery of the membrane filter by
directing a gentle stream of petroleum ether from the solvent dispenser from the edge of the
membrane toward the center, taking care not to wash contaminants off the filter. Maintain
vacuum after final rinse for a few seconds to remove the excess petroleum ether from the filter.
j. Using forceps, carefully remove the test filter from the funnel base and flow reducing
washer (if present) and place in a clean Petri dish. Dry in the oven at 90° ±5° C for 30 minutes
with the cover on the Petri dish slightly ajar. Remove the petri dish from the oven and place it
near the balance with the lid slightly ajar, but still protecting the filter from airborne
contamination, for 30 minutes. If more than one sample is processed, cooling time may have to
be increased. Reweigh the filter.
k. Record the total solids content in mg/liter by using the following formula:
mg/L
.
f
L
l. Should the sample exceed the 30-minute filtration time and a portion of the fuel is not
filtered, the solids content in mg/liter shall be reported as follows: Determine the volume of fuel
filtered by subtracting the mL of fuel remaining from 3785 mL.
g/L
L
f
f
.
m
A.7 LIMITS
A.7.1. Filtration time:
(1) The maximum allowable filtration time shall be 10 minutes for grade JP-4 and 15
minutes for grade JP-5.
(2) The vacuum shall exceed 67.5 kPa (20 inches of mercury) throughout the test;
i.e., the differential pressure across the filter should exceed 67.5 kPa (20 inches of mercury).
(3) The fuel temperature shall be between 18° C and 30° C.
A.7.2. Total solids: Maximum allowable particulate matter is 1.0 mg/liter.
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