MIL-PRF-81298E
4.4.4 Percent transmittance measurement. Accurately weigh to 0.0001 g
approximately 1.000 gram fluorescent dye in a 250 mL glass beaker. Dilute the above dye 1250
times (by weight) with spectral grade xylene (equivalent to American Chemical Society Regent
Grade, suitable for use in spectrophotometry). Agitate until the solution is uniform. Fill a 2.54
cm diameter glass tube cell with this solution. Measure the percent Transmittance of this
solution using a spectrophotometer at 525 nm (nanometer). Repeat the above procedure, but
this time, dilute the fluorescent dye 833 times with xylene.
4.4.5 Storage stability. Store a one liter sample of the liquid dye in its original
container at a laboratory room temperature of 25 °C ± 3 °C for 12 months. After 12 months,
shake the can vigorously by hand and examine visually for evidence of product deterioration or
can corrosion. After the visual examination, subject the stored sample to all examinations and
tests of this specification.
5. PACKAGING
5.1 Packaging. For acquisition purposes, the packaging requir ements shall be as
specified in the contract or order (see 6.2). When packaging of materiel is to be performed by
DoD or in-house contractor personnel, these personnel need to contact the responsible
packaging activity to ascertain packaging requirements. Packaging requirements are
maintained by the Inventory Control Point's packaging activities within the Militar y Service or
Defense Agency, or within the military service's system commands. Packaging data retrieval is
available from the managing Military Department's or Defense Agency's automated packaging
files, CD-ROM products, or by contacting the responsible packaging activity.
6. NOTES
(This section contains information of a general or explanatory nature that may be helpful, but is
not mandatory.)
6.1 Intended Use. The liquid dyes covered by this specification are intended to aid in
the detection of aircraft fuel system leaks by coloring aircraft fuels. Fuel system leaks accrue in
military aircraft due to the extreme stress conditions the airframes encountered. Commercial
aircraft are not subject to these stress conditions. There is no currently available non-
government standard which fulfills the requirements of this specification.
6.2 Acquisition requirements. Acquisition documents should specify the following:
a.
Title, number, and date of this specification.
b.
Type and color of dye required. (see 3.6).
c.
Packaging requirements (see 5.1).
d.
Quantity required and size containers desired.
e.
One copy of the certificate of analysis that lists those items in Table I and Table II
as applicable should be forwarded to the acquisition activity.
6.3 Conversion of metric units. Units of measure have been converted to the
Inter national System of Units ( Metric) in accordance with IEEE/ASTM S I10.
6.4 Safety. Adequate ventilation should be provided to remove the highly flammable
and toxic solvent vapors.
6.5 Material Safety Data Sheets. Contracting officers will identify those activities that
require copies of completed Material Safety Data Sheets (MSDS) prepared in accordance with
FED-STD-313. The pertinent Government mailing addresses for submission of data are listed
in FED-STD-313.
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