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MIL-DTL-19379 Mounts, Resilient, Mare Island Types 11M15, 11M25, And 10M50This specification covers Mare Island Rubber Laboratory type resilient mounts used to support equipment on surface ships and submarines. This specification includes requirements and verification tests for the rubber compound and fully assembled mounts.

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MIL-DTL-19379C(SH)
3.4 Materials.
3.4.1 Metal. Mount metal components shall be manufactured from steel or manganese bronze as specified
(see 6.2). Metal shall be in accordance with the appropriate specification listed in 803-1385824; substitutions are
permitted when approved by NAVSEA. Components shall be formed into shape and finished in accordance with
the dimensions and allowable tolerances specified in 803-1385824.
3.4.2 Rubber.
3.4.2.1 Resilient element. The resilient element of finished mounts shall be fabricated of oil resistant
compounds utilizing polymerized chloroprene as the basic material and molded into the form as shown in 803-
1385824.
3.4.2.2 Physical requirements. Physical properties of the cured rubber compound used in the resilient element
shall meet all requirements specified in table I.
TABLE I. Physical requirements.
Mount type
Verification
Property
11M15 and
method
10M50
11M25
1. Tensile strength (minimum) ­ before aging
2200 psi
2800 psi
2. Ultimate elongation (minimum) ­ before aging
650%
575%
3. Tensile strength (minimum) ­ after oven aging at 194 °F
2100 psi
2700 psi
4. Ultimate elongation (minimum) ­ after oven aging at 194 °F
600%
525%
5. Compression set (maximum) ­ after oven aging at 194 °F
40%
34%
6. Cold compression set (maximum)
50%
60%
7. Hardness
38±5
48±5
8. Volume change in oil (maximum)
15%
9. Adhesion to metal (minimum)
450 psi
550 psi
10. Specific gravity
Within 0.02 of the value
measured during qualification
3.5 Performance and construction requirements for finished mounts.
3.5.1 Construction requirements. Mounts shall be constructed in accordance with 803-1385824. In addition,
there shall be no backrinding, blisters, tears, cracks, or other defects on the outer surface of the resilient element.
MIL-STD-407, in conjunction with ASTM D1566, may be used to assist in identifying defects in the resilient
element (see 4.3.3.1).
3.5.2 Dynamic stiffness. The dynamic stiffness of mounts, when tested in the axial direction in accordance
with 4.4.2.1, shall be within the specified limits of table II.
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