MIL-PRF-1149D
TABLE II.
Physical requirements.
Type I
Type II
Test procedure
Initial properties:
Tensile strength, lb/in2
1000
1000
4.5.2
(minimum)
Ultimate elongation, percent
300
250
4.5.2
(minimum)
Hardness, durometer units
50 ± 5
65 ± 5
4.5.3
Specific gravity, class 1
1.65
1.75
4.5.4
(maximum)
Specific gravity, classes 2,3,
1.55
1.65
4.5.4
and 5 (maximum)
Properties after oven aging:
Tensile strength, percent
80
80
4.5.6
of initial (minimum)
Ultimate elongation, percent of
65
65
4.5.6
initial (minimum)
Hardness, Shore A
60
75
4.5.7
durometer (maximum)
Hot compression set,
75
75
4.5.8
percent (maximum)
Brittleness point
no cracks
no cracks
4.5.9
Properties after immersion:
Water extraction, percent
0.5
0.5
4.5.10
(maximum)
Oil resistance (for class 1
0 to +120
0 to +120
4.5.11
only), percent
Phosphate ester resistance
0 to +35
0 to +35
4.5.12
(for class 3 only), percent
Fuel resistance (for class 5
0 to +60
0 to +60
4.5.13
only), percent
5
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