a. 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 in. of mercury)
throughout the test; i.e., the differential pressure across the filter
should exceed 67.5 kPa (20 in. of mercury).
(3) The fuel temperature shall be between 18° and
b. Total solids: Maximum allowable particulate matter is 1.0