MIL-DTL-25988C
TABLE II. Physical properties, type I (O-rings) Continued.
Class 1
Class 1
Class 1
Class 3
grade 60
grade 70
grade 80
grade 75
After aging 70 hours in AMS 3021 @ the temperatures
302 ±5 °F
302 ±5 °F
302 ±5 °F
347 ±5 °F
indicated:
(150 ±2.8 °C)
(150 ±2.8 °C)
(150 ±2.8 °C)
(175 ±2.8 °C)
Hardness change, points, max.
±15
±15
±15
±20
Tensile strength decrease, %, max.
45
40
30
30
Elongation decrease, %, max.
30
25
15
20
Volume change, %
1 to 15
1 to 15
1 to 15
1 to 15
Compression set, %, max.
Under 0.110 inch (2.79 mm)
50
30
65
85
Over 0.110 inch (2.79 mm)
45
30
60
80
After aging 22 hours @ 75 ±5 °F (23.9 ±2.8 °C)
in AMS 2629, Type 1
Hardness change, points, max.
20
20
20
15
Tensile strength decrease, %, max.
50
45
30
35
Elongation decrease, %, max.
40
35
30
30
Volume change, %
1 to 25
1 to 25
1 to 25
1 to 25
1/ The permissible variation in specific gravity during actual production from that in first article tests shall be ±0.03.
8
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