MIL-DTL-17191E(SH)
4.3 Conformance inspection. Conformance inspection shall be performed on each production lot.
4.3.1 Lots. For the purpose of sampling for conformance inspection, a lot shall contain all mounts of one type
produced at the same time in the same facility under the same conditions with the same batch of rubber compound.
A lot number shall be assigned to the mounts and shall not be repeated in any one quarter. The lot number with
elastomer cure date (quarter, year) shall be traceable to the rubber batch number, manufacturing/process control
records, and conformance documentation. The lot number along with cure date shall be permanently marked on
each mount (refer to 803-1385777) and be included on all shipping documents, packages, and shipping containers.
4.3.2 Conformance inspection of the rubber compound. The specimens identified in table IX shall be prepared
for each mount lot produced and at least one set of specimens from each 450 pounds of rubber mixed. The
specimens shall be made from the same batch of rubber compound mixed for the manufacture of mounts in the lot.
The specimens shall be certified to be of the same material and equivalent cure as the corresponding lot of finished
mounts. These specimens shall be subjected to verification tests specified in table X to determine compliance with
3.3.3.2. If any specimens tested fail to meet any requirement, all mounts in the lot represented by that specimen
shall be rejected.
TABLE IX. Rubber specimens for conformance inspection.
Quantity
Specimen description
Property to be measured
3
ASTM D412, Die C: from sheets 0.08±0.01 by 6 by 6 inches
Tensile strength and ultimate
elongation
1
Cylinder: 0.50±0.02-inch height by 1.14±0.02-inch diameter
Hardness
TABLE X. Conformance tests on rubber specimens.
Verification test
Test method
Requirement
1. Tensile strength (unaged)
3.3.3.2 (table II, no. 1)
2. Ultimate elongation (unaged)
3.3.3.2 (table II, no. 2)
3. Hardness
3.3.3.2 (table II, no. 5)
4.3.3 Conformance inspection of finished mounts. Mounts shall be sampled and subjected to verification tests
4.3.3.1 Sampling for examination. For each lot, a quantity of mounts randomly sampled in accordance with
table XI shall be subjected to a visual examination to determine compliance with 3.4.1. Classifications of defects
are shown in table XII. If one or more major defect is found in any sample, the manufacturer may screen the entire
lot for compliance prior to proceeding with conformance testing; otherwise, the entire lot shall be rejected.
MIL-STD-407, in conjunction with ASTM D1566, may be used to assist in identifying defects in the resilient
element. Corrective action shall be taken to prevent the systematic occurrence of any defects.
TABLE XI. Sampling for visual examination.
Number of mounts in a lot
Number of mounts in a sample
40 or under
10
41 to 110
15
111 to 300
25
301 to 500
35
7
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