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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)

TABLE III. Rubber specimens for qualification.

Quantity

Specimen description

Property to be measured

ASTM D412, Die C

Tensile strength and ultimate elongation

from sheets 0.08�0.01 by 6 by 6 inches

(initial and aged), specific gravity

Rectangular: 0.08�0.01 by 1 by 2 inches

Resistance to oil (volume change in oil)

ASTM D429, Method A

Adhesion to metal

Cylinder: 0.125�0.005-inch thickness by

1.597�0.005-inch diameter

Cylinder: 0.49�0.02-inch height by

Hardness and compression set

1.14�0.02-inch diameter

TABLE IV. Qualification tests on rubber specimens.

Property

Verification method

Requirement

1. Initial tensile strength

4.4.1.1

3.4.2.2 (table I, no. 1)

2. Initial ultimate elongation

4.4.1.1

3.4.2.2 (table I, no. 2)

3. Tensile strength after oven aging

4.4.1.1 and 4.4.1.7

3.4.2.2 (table I, no. 3)

4. Ultimate elongation after oven

4.4.1.1 and 4.4.1.7

3.4.2.2 (table I, no. 4)

aging

5. Compression set after oven aging

4.4.1.2 and 4.4.1.7

3.4.2.2 (table I, no. 5)

6. Cold compression set

4.4.1.3

3.4.2.2 (table I, no. 6)

7. Hardness

4.4.1.4

3.4.2.2 (table I, no. 7)

8. Volume change in oil

4.4.1.5

3.4.2.2 (table I, no. 8)

9. Adhesion to metal

4.4.1.6

3.4.2.2 (table I, no. 9)

10. Specific gravity

4.4.1.8

3.4.2.2 (table I, no. 10)

4.2.2 Qualification inspection of finished mounts. If rubber specimens meet all requirements associated with

qualification inspection (see 4.2.1), then finished mounts shall be subjected to qualification inspection to determine

compliance with 3.3, 3.5, and 803 1385824. Four mounts for each type manufactured shall undergo qualification

testing. Two mounts shall be tested in accordance with table V. The remaining two mounts shall be tested in

accordance with table VI. Mounts shall be tested in the sequence shown in each table.

TABLE V. Qualification tests on finished mounts, group one.

Property

Verification method

Requirement

1. Physical appearance, dimensions

803-1385824 and table X

3.5.1

and materials

2. Dynamic stiffness

3. Static strength