MIL-DTL-22050E (SH)
TABLE I. Physical requirements of rubber compounds.
Grade 1
Grade 2
Grade 3
Initial properties:
Tensile strength, psi, minimum (min)
2400
2400
2200
Ultimate elongation, percent, min.
250
150
80
Hardness, Shore A durometer, points within 1 sec
65 + 5
80 + 5
90 + 5
Leachable chlorides (parts per million) maximum (max)
200
200
200
Properties after oven aging 166 Hours at 280 degrees
Fahrenheit (o F)
Tensile strength, percent of initial, min.
70
70
70
Ultimate elongation, percent of initial, min.
70
70
50
Hardness, change in Shore A durometer, points max.
15
15
15
Compression set, percent, max.
60
60
35
Properties after immersion in distilled water for 166 hours
at 330oF:
Tensile strength, percent of initial, min.
80
80
80
Ultimate elongation, percent of initial, min.
80
80
80
Volume change, percent (no shrinkage allowed)
0 to 10
0 to 10
0 to 10
Properties after immersion in 25 percent aqueous solution
of MEA for 166 hours at 330oF:
Tensile strength , percent of initial, min.
80
80
--
Ultimate elongation, percent of initial, min.
80
80
--
Volume change, percent (no shrinkage allowed)
0 to 10
0 to 10
--
Properties after 166 hours in steam at 330oF:
Tensile strength, percent of initial, min.
80
80
80
Ultimate elongation, percent of initial, min.
80
80
80
Volume change, percent, max.
5
5
5
Properties after 70 hours in steam at 390oF:
Tensile strength, percent of initial, min.
--
--
90
Ultimate elongation, percent of initial, min.
--
--
85
Hardness, change in Shore A durometer, points max.
--
--
3
Volume change, percent (no shrinkage allowed)
--
--
0 to 8
Compression set, percent, max.
--
--
60
Properties after 166 hours in steam at 550oF:
Tensile strength, percent of initial, min.
--
--
75
Ultimate elongation, percent of initial, min.
--
--
15
Hardness, change in Shore A durometer, points max.
--
--
10
Volume change, percent (no shrinkage allowed)
--
--
0 to 5
Compression set, percent, max.
--
--
90
3.4 Identification. Material acquired under this specification shall be identified with white markings. A
permanent marking material that will have no deleterious effect on the rubber shall be used or in the case of
individual one-item packaging, the marking may be put on the package.
3.5 Workmanship. The material shall be examined for defects as specified herein.
4
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