MIL-DTL-5624V
APPENDIX A
METHOD FOR DETERMINATION OF
FILTRATION TIME AND TOTAL SOLIDS (PARTICULATE)
A.1 SCOPE
A.1.1 Scope. This method describes a procedure to determine singularly or simultaneously
the filterability characteristics and solids contamination of jet fuel. The purpose is to detect and
prevent contaminants in jet fuel, which can plug and cause rupture of ground filtration
equipment, thereby affecting flight reliability/safety of aircraft. This appendix is a mandatory
part of the specification. The information contained herein is intended for compliance.
A.2 METHODS
A.2.1 Summary of method. 3.785 liters (1 gallon) of jet fuel is filtered through a membrane
filter in the laboratory. The time required to filter this volume is measured in minutes and solids
content is determined gravimetrically.
A.3 APPARATUS
a. Membrane filter: White, plain 47 mm diameter, nominal pore size 0.8 micron. The
membrane filter shall conform to the ASTM D5452 requirements.
b. Filtration apparatus: The apparatus, constructed of stainless steel, consists of a funnel
and funnel base with a filter support such that a membrane filter can be securely held between
the sealing surface of the funnel and the funnel base (see ASTM D5452, Figure 1).
c. Flow reducing washer: The flow reducer washer shall only be used with JP-4 fuel. A 47-
mm diameter paper flow reducer ring with dimensions to give a filtering area of 4.8 cm2.
(Millipore Corporation Part No. XX10 04710 or equivalent).
d. Vacuum flask: A minimum of 4 liters.
e. Vacuum system: That develops in excess of 67.5 kPa (20 in. of mercury) vacuum.
f. Oven: Of the static type (without fan assisted circulation) controlling to 90 5° C.
g. Forceps: Flat-bladed with unserrated, nonpointed tips.
h. Dispenser, rinsing solvent (petroleum ether): Containing a 0.45 micron membrane filter
in the delivery line. If the solvent has been pre-filtered using a 0.45 micron filter then an inline
filter is not required.
i. Glass Petri dish: Approximately 125 mm in diameter with removable cover.
j. Analytical balance: Single or double pan, the precision standard deviation of which shall
be 0.07 mg or better.
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