MIL-PRF-87260B(USAF)
the range from 100 to 800 cu, while in the range of temperatures from 160°F down to +10°F.
The range of conductivity shall be achieved through the use of fuel system conductivity
additives defined in MIL-DTL-83133.
c. Class II Materials. The Class II conductive materials shall not produce an incendiary
vapor ignition, electrical discharges, or excessive static charge build-up (electrical activity) when
impinged by JP-8 fuel that has a conductivity less than 10 cu as well as in the range from 100 to
800 cu, while in the range of temperatures from 160°F down to -25°F. The range of conductivity
shall be achieved through the use of fuel system conductivity additives defined in MIL-DTL-
83133.
3.7.8 Infrared spectrum analysis.
Infrared spectrum data shall be provided for the conductive material and reference standard
polyether foam.
3.7.9 Static charge dissipation test.
The conductive material(s) shall be evaluated to determine the time it takes for an induced
electrostatic charge to be dissipated at various temperatures including the following: 72, 60, 32,
determine the static charge dissipation times. For Class I the charge shall be dissipated at a
maximum of 10 minutes at 10°F. For Class II the charge shall be dissipated at a maximum of
10 minutes at -25°F. This charge dissipation test may be substituted for the 3.7.7 fuel
impingement test during qualification.
3.7.10 Electrochemical corrosion.
The conductive material shall neither adhere to nor cause any pitting, erosion, or discoloration
of metal plates. In addition, the material shall not produce a current flow greater than that for
blue polyether foam produced in accordance with MIL-DTL-83054.
3.7.11 Aircraft service test.
The service tested materials' critical properties shall not degrade below the minimum
specification requirements. The electrical resistivity shall not increase by more than two orders
of magnitude from the original baseline values nor shall it exceed 5.0 x 1012 ohm-cm. There
shall be no evidence of electrical buildup, discharge, vapor ignitions, or singeing (burning) of the
foam during the service test evaluations.
3.7.12 Manufacturing demonstration details.
The manufacturer shall successfully demonstrate that the material can be fabricated in the
various standard bun sizes defined in 3.8. Hot wire is acceptable for use in final fabrication
trimming of the materials provided it does not discolor the bun surfaces non-uniformly.
3.8 Dimensions and tolerances.
Material shall be produced in the following standard size buns:
a. Grade I 40 inches x 80 inches x 8 inches; 44 inches x 110 inches x 8 inches; 44
inches x 110 inches x 12 inches; and 44 inches x 110 inches x 4 inches
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