MIL-DTL-3432J
APPENDIX B
B.2.13 Jacketing compound, type JH low temperature, heat and weather resistant, ethylene-propylene (EPM), or
ethylene-propylene-diene rubber (EPDM).
Unaged:
Tensile strength, minimum psi
1600
Elongation, minimum %
400
Set, maximum inch
.375
Tensile stress, (200% elongation, minimum psi)
300
Tear resistance, minimum lb-in
25
After 168 ± 1 hour air oven aging at 121°C:
Tensile strength, minimum % of original
85
Elongation, minimum % of original
80
After 168 ± 1 hour oxygen bomb aging at 80°C:
Tensile strength, minimum % of original
85
Elongation, minimum % of original
70
After 20 ± 1 hour air pressure aging at 127°C:
Tensile strength, minimum % of original
85
Elongation, minimum % of original
80
Ozone resistance (after air oven conditioning and
168 ± 1 hour in ozone) at 120°F
no visible cracks
Brittleness temperature, unaged, max. °C
-55
After aging, max. °C
-55
Torsional stiffness ratio, max
10
Cold tension recovery, minimum
10
Torsional modulus at -55°C maximum psi
2000
B.2.14 Jacketing compound, type JU low temperature, heat and weather resistant, polyurethane thermoplastic
elastomer.
Unaged:
Tensile strength, minimum psi
3500
Elongation, minimum %
550
Set, maximum inch
.250
Tensile stress, (100% elongation, minimum psi)
550
Tensile stress, (300% elongation, maximum psi)
1000
Tear resistance, minimum lb-in
90
Durometer, "A" maximum points
82
After 20 ± 1 hour air pressure aging at 127°C:
Tensile strength, minimum % of original
50
Elongation, minimum % of original
50
Ozone resistance (after air oven conditioning and
168 ± 1 hour in ozone) at 120°F
no visible cracks
Brittleness temperature, unaged, max. °C
-55
After aging, max. °C
-55
Torsional stiffness ratio, max
35
Torsional modulus at -55°C maximum psi
20,000
37
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