MIL-DTL-17191E(SH)
TABLE II. Physical requirements of rubber compounds Continued.
Verification
Property
Class A
Class B
Class C
Class D
method
2. Elongation at break (minimum), percent
-Before aging
650
600
575
550
-After aging at 194 °F for 46 hours
600
550
525
500
3. Compression set (maximum), percent
40
37
34
30
4. Adhesion of resilient element to metal
450
500
550
600
(minimum), psi
5. Hardness, Shore A after 3 seconds
38±5
43±5
48±5
57±5
6. Resistance to oil swelling (maximum),
15
15
15
15
percent
3.3.4 Hazardous materials. Materials and products utilized in this specification should avoid chemicals listed
on the NAVSEA List of Targeted Chemicals (N-LTC). Refer to NAVSEA for the most recent list. These
chemicals pose significant risk to the user, the environment, or both, and are deemed both undesirable and
unsustainable by NAVSEA Technical Authority (TA). NAVSEA is minimizing the use of hazardous materials in
the design and development of its assets. It is recommended that alternative materials be considered for associated
applications, so as to minimize the integration of targeted chemicals in assets called out in this specification.
3.4 Requirements for finished mounts.
3.4.1 Construction requirements. Mounts shall be constructed in accordance with 803-1385777. 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. Refer to 4.3.3.1 for the compliance verification examination.
3.4.2 Dynamic stiffness. The dynamic stiffness (see 6.4.2) of the bonded spool type mounts at upper rated load
TABLE III. Axial dynamic stiffness requirements.
Mount type
Axial load (lb)
Dynamic stiffness (lb/in)
15P50A
50
830 to 1520
15P100A
100
1661 to 3040
15P150A
150
2491 to 4560
15P220A
220
3654 to 6689
15P300A
300
4983 to 9121
15P400A and 15P400B
400
6644 to 12161
15P550A and 15P550B
550
9135 to 16721
15P700A and 15P700B
700
11627 to 21282
15P800A and 15P800B
800
13287 to 24322
15P1000A and 15P1000B
1000
16609 to 30403
4
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