MIL-PRF-26542F
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 sheet. In the event of any conflict between requirements of
this specification and the specification sheet, the latter shall govern.
3.2 Qualification. Microphones furnished under this specification shall be products that are authorized
by the qualifying activity for listing on the applicable qualified products list before contract award (see 4.5
and 6.3).
3.3 Materials. All materials shall enable the parts to meet the performance requirements of this
specification. Materials which have measurable changes in property due to aging shall not be used, such
as ferrite magnets. Acceptance or approval of any constituent material shall not be construed as a
guaranty of the acceptance of the finished product.
3.3.1 Recycled, recovered, or environmentally preferable materials. Recycled, recovered, or
environmentally preferable materials should be used to the maximum extent possible provided that the
material meets or exceeds the specified requirements (see 3.1), and promotes economically
advantageous life cycle costs.
3.3.1.1 Unacceptable materials. Natural rubber or natural rubber cement shall not be used in the
microphone element. Rubber substitutes and plastic materials shall not be used as wedges and fillers.
3.3.2 Diaphragm material. The diaphragm material shall be metal or Mylar, or material having
equivalent or superior environmental and durability requirements in accordance with this specification.
3.3.3 Magnetic material. The magnetic material shall be in accordance with MMPA 0100-00.
3.3.4 Pure tin (see 6.5). The use of pure tin, as an underplate or final finish, is prohibited both
internally and externally. Tin content of microphone and microphone assembly components and solder
shall not exceed 97 percent, by mass. Tin shall be alloyed with a minimum of 3 percent lead, by mass.
3.4 Interface.
3.4.1 Cement. All cements shall be used in accordance with the manufacturer's or supplier's product
specification sheet. Cements shall not corrode or otherwise degrade the properties of materials to which
they are applied, nor to materials to which they are adjacent.
3.4.2 Color. The exterior of the microphone element shall be lusterless black, providing low contrast
with operational clothing and gear.
3.4.3 Components. Components which are supplied with the complete assembly shall be as specified
(see 3.1).
3.4.4 Cleanliness of air gap. There shall be no foreign material present in the air gap of the
microphone element when viewed through a microscope having a magnification of at least fifteen.
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