MIL-DTL-287J
3.3 Materials. Materials shall be as specified herein (see 3.1); however, when a definite material is not specified,
a material shall be used, with acquiring activity approval, which will enable the assemblies to meet the performance
requirements of this specification. Acceptance or approval of any constituent material shall not be construed as a
guaranty of acceptance of the finished product (see 4.7.1).
3.3.1 Flange. The material for the assembly flange shall be selected from the material of MIL-DTL-3922.
3.3.2 Jacket (when applicable). Unless otherwise specified (see 3.1), the jacket material shall be in accordance
3.3.2.1 Neoprene. Neoprene jackets shall be molded at least .0625 inch (1.588 mm) thick.
3.3.2.2 Plastic. Plastic jackets shall be fabricated from sealing compound in accordance with SAE-AMS-S-8802,
suitable for brush application with a minimum of 0.5 to 2 hours application time.
3.3.2.3 Silicone rubber. Silicone rubber jackets shall be in accordance with A-A-59588, class 2a.
3.3.2.4 Fluorosilicone rubber. Fluorosilicone rubber jackets shall be in accordance with SAE-AMS-R-25988.
3.3.3 Dissimilar metals. Unless suitably protected against electrolytic corrosion, dissimilar metals shall not be
used in intimate contact with each other (see 6.5.10).
3.3.4 Pure tin. The use of pure tin, as an underplate or final finish, is prohibited both internally and externally. Tin
content of rigid waveguide assembly components and solder shall not exceed 97 percent, by mass. Tin shall be
alloyed with a minimum of 3 percent lead, by mass (see 6.10).
3.4 Interface and dimensions. Assemblies shall be of design, interface and physical dimensions specified (see
3.4.1 Flange. All assemblies shall be terminated by flanges. Unless otherwise specified (see 3.1), the flange
shall mate electrically and mechanically with flanges covered by MIL-DTL-3922. The flange face shall make an
angle of 90° ± 15' with the E-plane and the H-plane of the internal surfaces of the assembly. The finish for the
flanges shall be as specified herein (see 3.4.3, 3.4.3.1 and 3.4.3.2 for approved finishes). Alternative finishes may
be used, with acquiring activity approval, provided they permit flanges to meet the performance requirements of this
specification. Acceptance or approval of any alternative finish shall not be construed as guaranty of acceptance of
the finished product (see 4.7.1). The optional use of "butt" type flanges is permitted.
3.4.2 Flexible waveguides. The physical dimensions of flexible waveguides shall be such that the operating
frequency range is equal to that of the mating rigid waveguides of MIL-DTL-85. Surface finishes of flexible
waveguides shall be as specified herein (see 3.4.3 and 3.4.3.3 for approved finishes). Alternative finishes may be
used, with acquiring activity approval, provided they permit flexible waveguides to meet the performance
requirements of this specification. Acceptance or approval of any alternative finish shall not be construed as a
guaranty of acceptance of the finished product (see 4.7.1).
3.4.3 Assembly finish. Specified finish shall be applied after assembly of flanges to flexible waveguides.
Approved surface finishes for flanges and for flexible waveguides shall be specified in 3.4.3.1 through 3.4.3.3.
Equivalent finishes meeting the requirements of this specification may be used with acquiring activity approval.
3.4.3.1 Finish for copper alloy flanges. Unless otherwise specified (see 3.1), all copper alloy flanges shall be
silver plated at least .0003-inch (0.008 mm) thick in accordance with ASTM-B700, with supplementary tarnish-
resistant treatment (chromate treatment).
3.4.3.2 Finish for aluminum alloy flanges. Unless otherwise specified (see 3.1), all aluminum or aluminum alloy
flanges which are used with copper alloy, OFHC copper, or beryllium copper flexible waveguides shall be copper or
electroless or electrolytic nickel plated in the recess of the flange or where the waveguide interfaces with the flange.
After the waveguide and flange are soldered or brazed together, the solder point and flange shall be chemically
treated in accordance with MIL-DTL-5541 or equivalent.
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