MIL-PRF-23586F
value from 4.7.5. After heat aging, the hardness shall not decrease by more than 7 points from the
deep section cure hardness.
3.3.2.4 Storage life. After being stored as specified in 4.7.18, the viscosity of the base
compound shall not exceed by more than 30 percent the as-received viscosity, and cured specimens
made from the stored compound shall exhibit a hardness within ±5 points of the as-received
hardness.
TABLE I. Physical properties after cure.
Characteristics
Requirements by type
Test paragraph
I
II
III
Hardness, points, minimum:
45
40
Class 1
45
30
35
Class 2
45
4.7.5
45
40
Class 3
45
50
35
Class 4
--
Tensile strength, psi, minimum
325
250
Classes 1,2, and 3
400
4.7.6
600
150
Class 4
---
Elongation, percent (%), minimum
100
100
Classes 1,2, and 3
100
4.7.6
150
Class 4
70
---
Linear shrinkage, %, maximum
4.7.7
Classes 1,2, and 3
1.0
1.0
1.0
Class 4
2.5
2.0
---
Specific gravity, maximum
1.50
4.7.8
Brittle point, °F, maximum
-90°
4.7.9
Adhesion, pounds, minimum
4
4.7.10
Hydrolytic stability: Hardness after
30
4.7.12
exposure, points, minimum
Water immersion 72 hours at 60°C,
change in:
±2
4.7.13
Weight, %, maximum
±3
Volume, %, maximum
Hardness, points, maximum
10
5
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