MIL-DTL-25988C
TABLE III. Physical properties, type II (molded parts (other than o-rings), sheets, strips, and extruded shapes) Continued.
Class 1
Class 2
Class 3
Grade 40
Grade 50
Grade 60
Grade 70
Grade 80
Grade 50
Grade 75
After aging 70 hrs. in AMS 3021 @ the
302 ±5 °F
302 ±5 °F
302 ±5 °F
302 ±5 °F
302 ±5 °F
302 ±5 °F
347 ±5 °F
temperatures indicated:
(150 ±2.8 °C)
(150 ±2.8 °C)
(150 ±2.8 °C)
(150 ±2.8 °C)
(150 ±2.8 °C)
(150 ±2.8 °C)
(175 ±2.8 °C)
Hardness change, points, max.
±15
±15
±15
±15
±15
±15
±20
Tensile strength decrease, %, max.
45
45
45
40
30
40
30
Elongation decrease, %, max.
30
30
30
25
15
30
20
Volume change, %
1 to 15
1 to 15
1 to 15
1 to 15
1 to 15
1 to 15
1 to 15
Compression set, %, max.
35
35
45
30
60
45
80
After aging 22 hrs. @ 75 ±5 °F
(23.9 ±2.8 °C) in AMS 2629, Type 1
Hardness change, points, max.
15
15
20
20
20
25
15
Tensile strength decrease, %, max.
65
55
50
45
30
40
35
Elongation decrease, %, max.
60
50
40
35
30
30
30
Volume change, %
1 to 30
1 to 25
1 to 25
1 to 25
1 to 25
1 to 25
1 to 25
1/ The permissible variation in specific gravity during actual production from that value established in first article tests shall be ±0.03.
10
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