MIL-DTL-15665J
3.4.8.2 Epoxy resin (stoning epoxy). Epoxy resin shall be a stoning
epoxy, have a shore D hardness of 85 and incorporate an ultraviolet
inhibitor.
3.4.8.3 Baking enamel. The enamel for subdued insignia shall be a
flat synthetic, baking enamel pigmented to the shade of black matching the
standards established in FED-STD-595 for Color Chip number 37038.
3.4.8.4 Soft enamel. Soft enamel shall be a baking enamel pigmented
to produce the required color or shade.
3.4.9 Lacquer. Lacquer shall be a pale clear synthetic lacquer.
The use of a pigmented lacquer shall not be permitted.
3.5 Design. The embossed design of the insignia shall be an exact
duplicate of the design on the Government loaned hubs (see 3.8), from
which the contractor's working dies shall be extracted. The contractor's
working die shall be tooled and polished to remove any dents, nicks,
scratches or other imperfections.
3.6 Construction. Army enlisted branch of service insignia shall be
constructed in accordance with details and dimensions shown on Drawing
4-4-89 (Figure 1).
3.6.1 Stamping, trimming and piercing. The stamping shall have a
well defined die struck edge. The insignia shall be trimmed and, when
applicable, pierced to the die struck edge. All edges shall be clean,
smooth and free from burrs, drag, step and rough edges. The stamping,
piercing and trimming operations shall not damage or distort the design or
alter the shape of the item.
3.6.2 Die casting. When die cast method is applicable, the insignia
shall be free from porosity, blow holes or other casting defects. Before
finishing, all flash lines shall be removed and the edges of the insignia
shall be smooth. Insignia that is die cast from zinc aluminum specified
in 3.4.3 shall be copper plated. When tested as specified in 4.5.2.2, the
plating shall be a minimum of 0.0003 inch thick (0.007 cm).
3.6.3
Soldering
3.6.3.1 Hard soldering and electronic fusion. Unless otherwise
specified on the applicable specification sheet, all soldering shall be
accomplished using hard solder specified in 3.4.7.1 or by electronic
fusion. Joints shall be clean, smooth, strong and free from burned or
reduced areas. There shall be no excess solder and all excess flux shall
be removed. When hard solder is used, the soldered part and prong shall
not separate at the joint when tested as specified in 4.5.4.1. When fused
joints are used, the prong shall not separate at the joint when tested as
specified in 4.5.5.
3.6.3.2 Soft Soldering. When soft solder is specified, soft solder
specified in 3.4.7.2 shall be used. When solder is specified for joining
a superimposed device to the insignia, the soldering shall be accomplished
using soft solder specified in 3.4.7.2 and complete contact shall be made
between the soldered parts. When tested as specified in 4.5.4.2, the
soldered device shall not separate.
3.6.4 Forcers. When forcers are permitted to bring up the design,
the back of the insignia shall have no sharp or rough edges. The
impression of the forcer shall be symmetrical with the embossed design of
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