MIL-DTL-81248C
4.5.1.2 Standards. Weigh exactly 0.20 grams of uranine that has been previously dried in an
oven at 110 °C for 0.5 hour and dissolve in 1 liter of distilled water. Label this solution "A".
Pipette 10 mL of solution "A" and dilute to 1 liter with distilled water. Label this solution "B".
Measure 1, 2, 3, 4 and 5 mL of the "B" solution respectively from a 5 mL buret and dilute to 100
mL using 100 mL volumetric flasks. These 5 solutions will contain 0.02, 0.04, 0.06, 0.08, and
0.10 micrograms of uranine per mL, respectively. Determine the fluorometer readings versus
uranine concentration in micrograms per milliliter on linear graph paper. This plot is the
standard against which unknown concentrations are determined.
4.5.1.3 Procedure. Random samples shall be selected as specified in 4.3.1 and analyzed for
uranine concentration according to the following procedure. The pad selected shall be placed
coated-side down in a Buchner funnel. A Buchner funnel with a plate diameter of 56 mm for the
47 mm pads, a plate diameter of 43 mm for the 37 mm pads, and a plate diameter of 30 mm for
the 25 mm pads shall be used. Alternate funnels and plates may be substituted as long as
suitable washing results are obtained. The pad shall be washed with distilled water until the pad
has turned completely white. After appropriate water rinses, the filtrate shall be transferred to a
1 liter volumetric flask and diluted to 1 liter. Pipette 10 mL of this solution into a 100 mL
volumetric flask and dilute to the mark. Determine the fluorometer reading, and calculate the
uranine content from the standard graph determined in 4.5.1.2.
4.5.2 Heat-seal integrity. All samples shall be conditioned at room temperature for at least 4
hours prior to the testing. The filled and sealed watervaporproof bags shall then be placed in a
humidity cabinet. Condition the samples for 16 hours at 38 + 1 °C (100 + 2 °F) and a relative
humidity of 90 to 95 percent. There shall be no moisture condensation on the test specimens.
The air circulation over the test specimens shall be negligible. After the conditioning period,
each bag shall be opened and examined for the presence of water. If moisture is not readily
apparent in the bag, immediately remove the detector pad and test for the presence of free water
as specified in 4.5.3 and 4.5.4.
4.5.3 Visual test for detector pad color. Immediately after opening the sealed
watervaporproof bag, the detector pad shall be visually inspected under normal lighting
conditions for color, uniformity of color, and fading. The pad shall have a uniform/even orange
color over the entire dyed surface. Under normal lighting, compare the pad to the standards
specified in paragraph 3.4. The pad orange color shall appear approximately equal to the
standard color. The pad shall be examined to ensure that fading of the pad has not occurred.
4.5.4 Contamination by water. Immediately after opening the sealed watervaporproof bag,
the detector pad shall be placed coated side up, under an ultraviolet lamp (equivalent to
specification MIL-D-81227 or MIL-D-22612 free water detectors). The detector pad shall be
visually examined under the fluorescent light for fluorescence that is characteristic of water
contamination. (Utilization of either specification MIL-D-81227 or MIL-D-22612 free water
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