MIL-PRF-15624G
TABLE II. Physical requirements of rubber.
First
Test
Material Condition
Conformance
Class I
Class II
Class III
Article
Method
Initial properties:
Tensile strength, psi, minimum
X
X
1500
1000
1500
Ultimate elongation, percent,
X
X
400
300
400
minimum
Hardness, durometer points,
X
X
50
50
50
maximum
Specific gravity, maximum
X
X
1.60
1.40
1.40
Tensile stress (modulus) psi at
X
X
As determined
As determined
As determined
100% elongation
Sealing pressure, psi, minimum
X
95
95
95
Properties after oven aging:
Tensile strength, percent of initial,
X
75
75
75
minimum
Ultimate elongation, percent of
X
70
70
70
initial, minimum
Hardness, durometer points,
X
65
65
65
maximum
Tensile stress (modulus) psi at
X
As determined
As determined
As determined
100% elongation
Compression set, percent,
X
30
30
30
maximum
Sealing pressure, psi, minimum
X
70
70
70
Properties after light aging:
Tensile strength, percent of initial,
X
75
75
75
minimum
Ultimate elongation, percent of
X
70
70
70
initial, minimum
Properties after low temperature aging:
No cracks,
No cracks,
No cracks,
Flexibility
X
tears, or
tears, or
tears, or
separation
separation
separation
Properties after liquid immersions:
Volume change, after water
X
0 to 5
N/A
N/A
immersion, percent
Extraction, percent, maximum
X
0.5
N/A
N/A
Volume change, after immersion
X
0 to 10
N/A
N/A
in ASTM No. 1 oil, percent
Volume change, after immersion
X
N/A
N/A
0 to 30
in Reference Fuel B, percent
4
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