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Page Title:
Table VIII. Materials for regulator. |
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|  MIL-D-18641F(SH)
TABLE VIII. Materials for regulator.
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3.11.11 Gasket application. For design pressures of 200 pounds per square inch (lb/in ) and
above, O-ring gaskets shall be used instead of flat gaskets. Blind gaskets (those incapable of being
replaced without destructive disassembly) shall not be used.
3.11.11.1 Flat gaskets. Flat gaskets shall be 1/16 or 1/8-inch thick. Components shall be so
constructed that a minimum gasket width of 5/16 inch is provided under waterbox partitions.
Gasket material shall be acid resistant synthetic rubber in accordance with MIL-R-21252 exempt
that non-asbestos gasket sheet in accordance with MIL-G-24696 shall be used where the
temperature of metal surfaces contacting the gasket will exceed 250 degrees Fahrenheit ("F') during
any condition of operation.
3.11.11.2 O-ring gaskets. O-ring gaskets shall conform to class 1 of MIL-R-83248 or to type I
of MIL-G-21610, except for the special applications for adaptors and plugs; in these cases; O-ring
gaskets in accordance with class 2 of MIL-R-83248 shall be used. O-ring segments for sealing
under waterbox partitions shall be integral with the peripheral O-ring. Design of retaining grooves
for O-ring gaskets shall conform to MIL-G-5514.
3.11.12 Recovered materials. Unless otherwise specified herein, all equipment material, and
articles incorporated in the products covered by this specification shall be new and may be
fabricated using materials produced from recovered materials to the maximum extent practicable
without jeopardizing the intended use. The term "recovered materials" means materials which have
been collected or recovered from solid waste and reprocessed to become a source of new materials,
as opposed to virgin raw materials. None of the above shall be interpreted to mean that the use
of used or rebuilt products is allowed under this specification unless otherwise specifically specified.
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