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|  MIL-F-8615D
3.4 Materials. Materials and processes shall conform to applicable Govern-
ment specifications. Materials conforming to contractor's specifications
may be used after approval by the procuring activity. All materials shall
be resistant to the fuels, fuel vapors, humidity, salt fog, and other environ-
mental factors encountered in service.
3.4.1 Fungus proof. Materials that are nutrients for fungi shall not be used
where it is practical to avoid them. Where used and not hermetically sealed,
they shall be treated with fungicidal agent acceptable to the procuring acti-
vity; however, if used in a hermetically sealed enclosure, fungicidal treatment
will not be necessary.
3.4.2 Metals. Metals shall be of the corrosion-resistant type or suitably
treated to resist corrosion due to contact with materials or exposure to
environments likely to be met in storage or normal service. Metals shall
be inspected in accordance with FED-STD-151.
3.4.2.1 Dissimilar metals. Unless suitably protected against electrolytic
corrosion, dissimilar metals shall not be used in intimate contact with each
other. Dissimilar metals are defined in MIL-STD-889.
3.4.2.2 Magnesium and copper. Magnesium and copper or alloys thereof shall
not be used in contact with fuel.
3.4.2.3 Castings and forgings. Castings shall be in accordance with MIL-C-6021,
or MIL-A-21180. The minimum acceptable elongation shall be 3 percent. Steel
forgings shall satisfy the applicable requirements of MIL-F-7190.
3.4.3 Rubber. Rubber materials shall conform to MIL-P-5315, MIL-R-6855,
Class I, MIL-R-25988 or MIL-R-83248. All other elastomeric materials are
required to have specific approval from the procuring activity for the
particular application.
3.4.4 Finishes and coatings. All finishes and protective treatments shall
be in accordance with applicable Government specifications. The use of any
protective coating that will crack, chip, peel, or scale because of age or
the aircraft operational environment is prohibited. Paint shall not be used
on surfaces normally in contact with fuel.
3.4.4.1 Cadmium plating. Cadmium plating shall conform to QQ-P-416, Class 2,
Type II. Cadmium plating shall not be used on surfaces which would normally
be in contact with fuel, unless specifically approved by the procuring activity.
3.4.4.2 Chromium plating.
Chromium plating shall conform to QQ-C-320,
Class 2.
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