MIL-PRF-87260B(USAF)
f. Appropriate MIL-DTL-83133 fuel property tests (including existent gum, particulate
matter, and filtration time) shall be performed periodically to aid in identifying test facility
contamination. Existent gum test should also be run periodically to control the charge tendency
of the fuel that may be affected by the extractable from the candidate materials.
g. A suggested test setup for the 55-gallon test rig is shown in APPENDIX A of this
specification.
4.5.23.1 Test data requirements.
The critical flow rates associated with the presence of discharges from flow charge generation
shall be reported for the candidate material and the blue and orange baseline materials. The
associated field strengths, induced voltages, charge transfer levels, and variances in fuel
conductivity shall also be reported. In addition, any vapor ignitions that occur shall be
documented and the burned material retained for examination.
4.5.24 Infrared spectrum analysis test.
The conductive material shall be characterized (identified) by an infrared spectrometer using a
frustrated multiple internal reflectance (FMIR) technique. The spectrum shall be of such detail
as to clearly distinguish it from the baseline polyether material. A reference polyether spectrum
shall be included for comparison. The following criteria shall be satisfied where applicable:
a. The baseline of the spectrum determined at 5 microns wavelength shall be a minimum
of 95 percent transmittance.
b.
The scan speed shall be such as to obtain optimum resolution.
c. A 45° KRS-5 prism, Perkin-Elmer Corporation P/N 186-1595, or equivalent, and an
FMIR attachment, Perkin-Elmer Corporation P/N 186-0174, or equivalent, shall be used to
maintain the specimen for analysis. All equipment used as well as details of the test procedure
and instrument settings (scan speed, slot setting, etc.) shall be identified for future reference.
4.5.25 Electrochemical corrosion test.
This test is intended to identify foam materials that may act as an electrolyte in high humidity
environments and in the presence of dissimilar metals. The electrochemical corrosion potential
of the conductive material shall be evaluated by placing it in contact with dissimilar metals at
120 ±5°F and 100 percent relative humidity for 7 days. Measurements of current flow and
corrosion/adhesion shall be made at specified, periodic intervals. For comparison, a similar set
of cells, using the vendor's baseline blue polyether (MIL-DTL-83054) shall also be tested.
4.5.25.1 Testing requirements.
Testing shall be conducted in a condensing humidity cabinet (bath) at 120 ±5°F for 7 days with
measurements of initial current flow (after approximately 1 hour of exposure) and then at 1, 3, 5,
and 7 days. Visual inspection and photographing of the plates for corrosion and adhesion shall
be performed initially and then at 7 days. Test equipment required for the current flow
measurements shall include a Keithley Electrometer Model 616, or equivalent. The meter used
shall be set to the 10-6 ampere scale. Bonding of the test panels shall be with the standard
number 18 or 20 American wire gage (AWG) wire attached to each plate with "alligator" clamps
or with copper-nickel print (adhesive) and epoxy overcoat. The test cells shall consist of a
"sandwich" of two standard stock finished metal panels (6 inches x 3 inches x stock thickness),
32
For Parts Inquires call Parts Hangar, Inc (727) 493-0744
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business