Prohibited materials are specified in 5.1.3.10.
Materials shall be in accordance with Table XII and as specified herein.
5.1.7.8.1 Brittle materials. Brittle materials are of concern due to
performance under shock and fatiguing. General guidance is provided in the
notes section of MIL-S-901 for elongation requirements. Castings for equipment
mounted on the mast shall have no less than 10 percent elongation. This may be
achieved with properly fabricated alloys of the ALMAG family.
5.1.7.8.2 Metals and alloys. Metals and alloys shall be corrosion-resistant
or shall be given a corrosion-resisting treatment or coating.
5.1.7.8.2.1 Dissimilar metals. the selection of metals for use in
electronic equipment shall be made in accordance with MIL-STD-889. When
electronic design requirements preclude the insulation of incompatible metal
combinations as identified in MIL-STD-889 from one another, specific attention
shall be paid to isolating the combination from exterior environments.
5.1.7.8.2.2 Insulation of dissimilar metals. Where it would otherwise
result in dissimilar metals being assembled in intimate contact with each
other, an interposing material compatible to each shall be used. Insulating
material is not required between corrosion-resisting steel inserts and
aluminum castings when the inserts are integrally cast in the aluminum.
