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|  MIL-S-52506D(ME)
Used, rebuilt or remanufactured components, pieces and parts shall not be
incorporated in the seals.
3.4 Sealing washer.
The sealing washer shall be a mixture of carbon, graphite,
and either babbitt or resin.
The sealing washer shall have the following physical
properties:
Hardness, minimum
60 (using ASTM C 886)
Compressive strength, minimum
32,000 pounds per square inch (psi)
Transverse strength, minimum
10,000 psi
Tensile strength, minimum
2900 psi
Specific gravity
1.75 minimum - 3.20 maximum
Coefficient of linear thermal
(1/F)
2.95 X
expansion, maximum
Resistance to heat as
specified (see 6.2):
Resin type
(260
500
Babbitt type
300
(149
3.5 Seat.
The seat shall be gray iron alloy conforming to ASTM A 319, class I
or II; or ceramic material conforming to MIL-I-10, grade L524 C, as specified (see
6.2).
3.6 Static seals.
The seat ring or the O-ring and the bellows shall be an
elastomer meeting the requirements of ASTM D 2000, line call out
M2BG614A14B14EF21034F17.
All rubber seals shall be less than 12 months old on
date of acceptance by the Government.
3.7 Retainer.
The retainer shall be corrosion-resistant steel conforming to
ASTM A 167, UNS S30400.
3.8 Spring.
The spring shall be corrosion-resistant steel conforming to ASTM
A 313, UNS S30200 or S30400.
The drive band and spring holder shall be
3.9 Drive band and spring holder.
corrosion-resistant steel conforming to ASTM A 167, UNS S30400.
3.10
The seal contact surfaces shall be lapped flat and
Seal contact surfaces.
smooth to not more than 4 light bands for the softer surface and not more than 3
light bands for the harder surface.
3.11 Performance.
The seal shall prevent leakage of liquid between the
rotating pump shaft-and the adjacent stationary pump parts at the shaft speed and
pressure specified on the applicable figures.
There shall be no accumulation of
escaped liquid from the seal after run-in.
3.12 Lubrication.
The seal shall be lubricated with light oil during initial
installation of the seal.
Subsequently, the seal shall be continuously self-
lubricating utilizing the fluid being pumped.
3.13
Identification marking.
The seal shall be identified in accordance with
MIL-STD-130 and shall include part or identifying numbers (see 6.4).
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