MIL-PRF-81298E
in a single plant run (not to exceed 24 hours), through the same processing equipment, with no
change in the ingredient materials.
4.3.2 Sampling Plans.
4.3.2.1 Sampling for the examination of filled containers. Take a random sample of
filled containers from each lot in accordance with ANS I/ASQC Z1.4.
4.3.2.2 Sampling for tests. Take samples from bulk or packaged lots for tests in
accordance with ASTM D4057 or ASTM D4177, or both, except where individual test
procedures contain specific sampling instructions.
4.4 Inspection test methods. Tests to determine conformance to chemical and physical
requirements shall be conducted in accordance with ASTM Standards, using the applicable
methods as listed in Table I, Table II and 4.4.1 through 4.4.5.
4.4.1 Particulate contamination. Aviation turbine fuel conforming to MIL-DTL-5624,
grade JP-5, shall be filtered through a 0.45 micrometer membrane manufactured by Millipore
Filter Corporation, 225 Ashby Road, Bedford, MA 01730 or equivalent. Dye the prefiltered fuel
in the ratio 57 g of dye to 378 L of fuel, assuring a uniform mixture. The contamination resulting
from the dissolved liquid dye shall be determined in accordance with ASTM D2276. Repeat this
test using prefiltered fuel conforming to MIL-DTL-83133, grade JP-8.
4.4.2 Thermal stability. Fuel conforming to MIL-DTL-5624, grade JP-5, or MIL-DTL-
83133, grade JP-8, shall be blended in ratios 45 g of dye in 378 L of fuel. When testing in
accordance with ASTM D3241, the thermal stability of the dyed JP-5 or JP-8 fuels shall meet
MIL-DTL-5624 or MIL-DTL-83133 requirements, as applicable.
4.4.3 Color value and wavelength of maximum absorption. Accurately weigh to
0.0001 g a 0.3800 g to 0.4000 g sample of red dye or a 0.4200 g to 0.4400 g sample of yellow
dye and transfer to a 100 mL volumetric flask. Any amount within the given ranges may be
taken. Dilute to the mark with spectral grade xylene (equivalent to American Chemical Society
Reagent Grade, suitable for use in spectrophotometry). Agitate until the solution is uniform.
Using a class A pipette, tr ansfer 2.00 mL of this solution into a 250 mL volumetric flask and
dilute to a mark with iso-octane. Record the visible spectrum of the final solution in a 1.000 cm
cell versus that of iso-octane employing a spectrophotometer which has been checked for
wavelength accuracy and photometric accuracy by standard procedure. Determine the
wavelength of maximum absorbance by inspection of the curve. Calculate the absorptivity of a
liquid dye using expression:
A
a=
(bc)
Where:
a = absorptivity
A = absorbance of the solution at the wavelength of maximum absorbance
b = cell thickness in centimeters (cm)
c = concentration of the liquid dye in iso-octane in grams per liter. If the recommended
procedure is followed then the concentration of the measure dye solution in grams
per liter is equal to the sample weight in grams divided by 12.5 liters.
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