MIL-DTL-81248C
3.2.1.1 Dimensions. The thickness of the paper disc shall be 0.610 + 0.076 millimeter (mm)
(0.024 to 0.003 inch). The diameter shall be:
Size 1 - 37.0 + 0.5 mm (1.46 + 0.02 inches)
Size 2 - 47.0 + 0.5 mm (1.85 + 0.02 inches)
Size 3 - 25.0 + 0.5 mm (0.98 + 0.02 inch)
3.2.2 Uranine coating. Each blotting paper disc (3.2.1) shall be surface coated on one side
with a solution of uranine, (fluorescein, sodium) with a minimum dye content of 98.5 percent
(equivalent to USP grade) in any of the following denatured ethyl alcohol formulations: 1, 2A,
2B, 3A, 12A, 28A, and 30. The requirements of USP-NF XVIII may be used as a basis for
acceptance as an alternate for the current edition of the USP-NF. When tested as specified in
4.5.1 there shall be:
37 mm disc - 0.56 + 0.06 milligrams of uranine per disc
47 mm disc - 0.9 + 0.1 milligrams of uranine per disc
25 mm disc - 0.26 + 0.03 milligrams of uranine per disc
3.3 Heat-sealed unit pack. The test pads shall be individually packaged (unit pack) in a heat-
sealed watervaporproof bag conforming to MIL-DTL-117, Type I , Class E, style 1. When
subjected to the test specified in 4.5.2, the sealed watervaporproof bag shall show no sign of
leakage. There shall be no evidence of water in the sealed bag after exposure to 90 to 95 percent
relative humidity and at a temperature of 38 °C (100 °F) for 16 hours.
3.4 Visual detector pad color. The detector pad, immediately after removal from its
watervaporproof bag, shall be subjected to a visual test as specified in 4.5.3. The detector pads
shall have a uniform orange color over the dyed surface. An acceptable pad shall yield a color
approximately equal to the ASTM-E308 color specified by CIE L*a*b* values L* = 73.7, a* =
36.3, b* = 59.7 (CIE Illuminant D65 and CIE 2 Degree Standard Observer). An unacceptable
pad shall yield a color approximately equal to the color specified by CIE L*a*b* values L* =
75.5 a* = 34.1 b* = 63.2 (CIE Illuminant D65 and CIE 2 Degree Standard Observer). Any
discoloration, inconsistency in color, or fading (orange to yellow coloration) shall be cause for
rejection.
3.5 Contamination by water. When tested under ultraviolet light as specified in 4.5.4, the
detector pad, immediately after removal from its sealed watervaporproof bag, shall show none of
the characteristic fluorescence resulting from the presence of free water (indicated by a
discoloration of the pad, yellowing or yellow spots).
3.6 Filterability/flow. The detector pad, immediately after removal from its watervaporproof
bag, shall be subjected to the fuel flow test specified in 4.5.5. Five hundred milliliters of aviation
turbine fuel conforming to either MIL-DTL-5624, MIL-DTL-83133, or ASTM-D1655 shall be
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