MIL-DTL-17191E(SH)
TABLE XIII. Sampling for conformance tests Continued.
Number of mounts in a lot
Sample quantity
181 to 300
8
301 to 500
10
501 to 800
12
801 to 1300
15
1301 to 3200
20
TABLE XIV. Conformance verification tests.
Verification test
Test method
Requirement
1. Dynamic stiffness
2. Static strength test in axial direction
Axial strength test shall be in accordance with
4.4.2.2.2 except the peak load obtained shall be from
Curve 2 for all four loading-unloading cycles.
4.4 Verification tests. Unless otherwise specified in a particular test procedure, all tests shall be conducted at
an ambient temperature of 80±10 °F. Within this range, the temperature from the beginning to the end of any one
test shall not vary more than ±5 °F.
4.4.1 Test methods for rubber specimens.
4.4.1.1 Tensile and elongation tests. For tensile strength and elongation, the method of tests shall be in
accordance with ASTM D412, Method A, using three Die C test specimens.
4.4.1.2 Compression set. For compression set tests, rubber specimens with a hardness less than or equal to
44 durometer shall be compressed 40 percent. Rubber specimens with a hardness greater than or equal to
45 durometer shall be compressed 30 percent.
4.4.1.2.1 Compression set after aging. Compression set shall be determined on two test specimens in
accordance with ASTM D395, Method B, except aging shall be as specified in 4.4.1.3.
4.4.1.2.2 Cold compression set. Cold compression set shall be determined in accordance with ASTM D1229
on two rubber specimens, except exposure shall be 30±2 °F for 94±½ hours. The compression set shall be
determined 30 minutes after the compressive load is released.
4.4.1.3 Oven aging test. The specimens for tensile, ultimate elongation, and compression set tests shall be
given an accelerated aging test by subjecting them to dry circulating air at a temperature of 194±2 °F for
46±¼ hours. Final determination of aged tensile and elongation specimens shall be made not less than 10 hours or
more than 48 hours after removal from the oven. Tensile and elongation tests on unaged specimens shall be made
immediately prior to, and on the same machine as, the tensile tests on the aged specimens. Refer to ASTM D573 for
guidance.
4.4.1.4 Hardness test. Hardness (Shore A) of the 0.49±0.02-inch thick specimens shall be determined in
accordance with ASTM D2240. A 3-second reading shall be taken to determine conformance.
4.4.1.5 Swelling in oil. Volume change in oil shall be determined in accordance with ASTM D471, except the
three specimens shall be immersed for a period of 46±¼ hours at 73±4 °F. The specimen shall be immersed in
reference oil IRM 903 of ASTM D471.
4.4.1.6 Adhesion to metal test. The adhesion tests shall be in accordance with Method A of ASTM D429.
Three specimens of the rubber compound bonded to metal shall be tested and results averaged to determine
compliance. Specimens shall have the same surface preparation, adhesive system, metal type, and bonding method
as used in the finished mount. Refer to table IV for specimen description.
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