MIL-DTL-28788C
SOCIETY OF AUTOMOTIVE ENGINEERS
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Insulation Compound, Electrical, Ceramic, Class L
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Insulating Compound, Electrical, Embedding, Reversion Resistant Silicone.
(Application for copies can be found online at https://www.sae.org or should be addressed to the
Society Of Automotive Engineers (SAE) World Headquarters, 400 commonwealth Drive, Warrendale, PA
15096-0001)
2.4 Order of precedence. Unless otherwise noted herein or in the contract, in the event of a conflict
between the text of this document and the references cited herein (except for related specification
sheets), the text of this document takes precedence. Nothing in this document, however, supersedes
applicable laws and regulations unless a specific exemption has been obtained.
3. REQUIREMENTS
3.1 Specification sheets. The individual item requirements shall be as specified herein and in
accordance with the applicable specification sheets. In the event of any conflict between requirements of
this specification and the specification sheet, the latter shall govern (see 6.1).
3.2 Switch categories. Switches furnished under this specification shall be category I or II as
defined herein.
3.2.1 Category I. Switches completely defined by a military specification sheet.
3.2.2 Category II. Switches the same as category I, except for minor differences such as
terminations, mounting means, or flow settings, which do not change the basic design or construction of
the qualified switch. Category II shall be procured from a source listed on the applicable qualified
products list for the particular similar product in category I. Category II switches are nonstandard.
3.3 Qualification. Category I switches furnished under this specification shall be products which are
qualified for listing on the applicable qualified products list at the time set for opening of bids (see 4.5 and
6.2).
3.4 Material. Material shall be as specified herein. However, when a definite material is not
specified, a material shall be used which will enable the switches to meet the performance requirements
of this specification. Acceptance or approval of any constituent material shall not be construed as a
guaranty of the acceptance of the finished product.
3.4.1 Metals. All metal parts exposed to environmental conditions shall be of a corrosion-resistant
material or shall be suitably plated to resist corrosion.
3.4.1.1 Ferrous material. Ferrous material shall not be used for current-carrying parts except for
feed-through terminals in headers.
3.4.1.2 Dissimilar metals. When dissimilar metals are used in intimate contact with each other,
protection against electrolysis and corrosion shall be provided. The use of dissimilar metals in contact,
which tend toward active electrolytic corrosion (particularly brass, copper, or steel used in contact with
aluminum or aluminum alloy), it is not acceptable. However, metal-spraying or metal plating of dissimilar
base metals to provide similar or suitable abutting surfaces is permitted. The use of dissimilar metals
separated by a suitable insulating material is also permitted.
3.4.1.3 Pure tin. The use of pure tin, as an underplate or final finish, is prohibited both internally and
externally. Tin content of switch components and solder shall not exceed 97 percent, by mass. Tin shall
be alloyed with a minimum of 3 percent lead, by mass (see 6.6)
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