MIL-PRF-2912G (SH)
2.4 Order of precedence. In the event of a conflict between the text of this document and the references
cited herein, the text of this document takes precedence. Nothing in this document, however, supersedes
applicable laws and regulations unless a specific exemption has been obtained.
3. REQUIREMENTS
3.1 First article. When specified (see 6.2), a sample shall be subjected to first article inspection in
accordance with 4.4.
3.2 Material.
3.2.1 Physical properties. The material in the Type II lining shall conform to the physical requirements
specified in Table I.
TABLE I. Physical requirements of rubber compounds.
Description
Requirement
Test
procedure
Compatibility
No softening or
4.2.2
decomposition
Tensile strength, initial, pounds per square inch (lb/in2),
1400
4.6.2
minimum
Ultimate elongation, initial, percent minimum
250
4.6.2
Adhesion to steel and between plies, rate of separation under a
1
4.6.3
15-pound load, inches per minute, maximum
After oxygen pressure aging:
4.6.4
Tensile strength, percent change from initial, maximum
25
4.6.4.1
Ultimate elongation, percent change from initial, maximum
25
4.6.4.1
Adhesion to steel and between plies, rate of separation under a
1
4.6.4.2
12-pound load, inches per minute, maximum
After immersion in acid:
4.6.5
Weight, percent change from initial, maximum
2
4.6.5.1
Tensile strength, percent change from initial, maximum
25
4.6.5.2
Ultimate elongation, percent change from initial, maximum
25
4.6.5.2
After immersion in oil:
4.6.6
Volume, percent change from initial, maximum
15
4.6.6.1
Tensile strength, percent change from initial, maximum
20
4.6.6.2
Ultimate elongation, percent change from initial, maximum
20
4.6.6.2
Adhesion to steel and between plies, rate of separation under a
1
4.6.6.3
12-pound load, inches per minute, maximum
Plastic flow characteristics:
4.6.7
Original deflection, inches, maximum
0.020
Deflection after 48 hours, inches, maximum
0.028
Increase of deflection after 48 hours, due to plastic flow, inches,
0.010
maximum
Hardness, Shore A durometer
50 to 70
4.6.8
3.2.2 Recycled, recovered, or environmentally preferable materials. Recycled, recovered, or
environmentally preferable materials should be used to the maximum extent possible provided that the material
3
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