MIL-DTL-11891G(AT)
TABLE III. Classification of inspection and frequencies (bushings).
Require-
First
In-process
Control
Title
ment
Inspection Qualification
article
inspection
CI
test
Specific gravity
3.3.3.2
4.7.1.1
1/
1/
1/ Batch
Hardness
3.3.3.3
4.7.1.2
1/
1/
1/ Shift
1/Shift
Tensile strength
3.3.3.4
4.7.1.3
1/
1/
1/ Shift
Tensile strength
3.3.3.5
4.7.1.4
1/
1/
1/ Month
(aged)
Ultimate elongation
3.3.3.4
4.7.1.5
1/
1/
1/ Shift
Ultimate elongation
3.3.3.5
4.7.1.6
1/
1/
1/ Month
(aged)
Tensile stress
3.3.3.4
4.7.1.7
1/
1/
1/ Shift
TGA
3.3.3.6
4.7.1.8
1/
1/
1/ Bi-Monthly
Cure meter
3.3.3.7
1/
1/ Batch
4.7.1.9
1/
Adhesion
3.3.3.8
1/
1/
4.7.1.10
1/Shift
Compression set
3.3.3.9
1/
1/
1/ Month
4.7.1.11
1/
1/
1/ Monthly
Brittleness
3.3.3.10
4.7.1.12
GC mass spec
3.3.3.11
1/
1/
4.7.1.13
4/
Bushing fill
1/Mold
1/Mold
3.5.4
4.7.1.14
1/New
Mold
Concentricity
2/
2/
3.5.4.1
4.7.1.15
2/
2/
2/
Workmanship
3.5.2
4.5.3.1
2/
Product marking
2/
2/
3.3.4.13
4.5.3.1
2/
Endurance
1/
3.4.1
4.3.3
3/
NOTES:
1/ Samples shall be taken as specified in section 3. Unless otherwise specified (see 6.2),
sample size shall be one.
2/ Sample size shall be in accordance with table V.
3/ Bushing endurance shall be run as specified by the Procuring Activity. During the
course of any given contract, no more than three (3) tests shall be required.
Requirements and sample size shall be in accordance with 3.4.1.
4/ The Government may require samples as specified in 3.3.3.11.
5/ One batch is identified as a full mixer of rubber compound. 1/batch indicates one
sample per batch. 1/bi-monthly indicates one sample every other month.
6/ Samples shall be selected at the location specified in 4.3.1.1 and 4.3.1.2. For
in-process tests, samples are picked right after or while batches are being finalized.
Control Tests would normally be performed on finished bushings (vulcanized).
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