MIL-DTL-83425A
3. REQUIREMENTS
3.1 First article. When specified (see 6.2 ), a sample shall be subjected to first article inspection
(see 4.3).
3.2 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 operational and maintenance requirements, and promotes economically
advantageous life cycle costs.
3.3 Materials. Materials shall conform to the requirements specified herein. Materials that are not
covered by specifications or that are not specifically described herein shall be the best quality and shall
be entirely suitable for the intended purpose.
3.3.1 Rigid shell. The material for the rigid shell shall be molded plastic conforming to group 01, class
3.3.2 Hook fastener tape. The hook fastener tape shall be 2 inches wide, shall have a solvent-
activated-adhesive backing, and shall conform to type I, class 1 of A-A-55126. The color of the hook
fastener tape is optional.
3.3.3 Draw cords. The material for the draw cords shall be natural color and shall conform to type I or
IA of MIL-C-5040.
3.3.4 Polyurethane foam. The polyurethane foam for the cushion and for the fillers shall conform to
type I, class 2 of MIL-PRF-265l4. The minimum density of the polyurethane foam for the cushion shall be
5 pounds per cubic foot. The minimum density of the polyurethane foam for the fillers shall be 3 pounds
per cubic foot. The color of the polyurethane foam for the cushion and for the fillers shall be optional.
The thickness of the polyurethane foam for the cushion shall be as specified in Drawing 7136038. The
thickness of the polyurethane foam for the fillers shall be optional, provided the fillers conform to the
requirements specified in 3.4.3.
3.3.5 Pure tin. The use of pure tin, as an underplate or final finish, is prohibited both internally and
externally. Tin content of the earcup components and solder shall not exceed 97 percent, by mass. Tin
shall be alloyed with a minimum of 3 percent lead, by mass (see 6.3)
3.3.6. Plastic film. The plastic film for the cushion shall conform to type I of ASTM D1593, except that
the temperature range shall be from -67° to +185° Fahrenheit. The color of the plastic film shall be
semigloss gray and conform to FED-STD-595/26329. The thickness of the plastic film shall be as
specified in Drawing 7136038.
3.4 Design and construction. The design of the earcup shall provide a sound attenuation earcup that
can be comfortably worn by all personnel, including personnel wearing eyeglasses, and that will be
compatible with the H-143/AIC earphone, which is specified in MIL-PRF-25670/2. The earcup shall
consist of a shell, a cushion, and fillers. The earcup shall be designed to permit easy assembly and
disassembly without the use of any tool, except for the installation of an earphone which will require the
tightening of set screws against electrical conductors. The earcup shall conform to the requirements that
are specified herein and on the applicable drawings. In the event of conflict between the text of this
specification and the drawings, the text of this specification shall govern.
3.4.1 Shell. The shell shall consist of a rigid shell, a grommet, hook fastener tape, and two draw cords.
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