MIL-DTL-3432J
APPENDIX B
B.2.9 Jacketing compound, type JS-L low temperature, heat resistant, styrene butadiene rubber.
Unaged:
Tensile strength, minimum psi
1500
Elongation, minimum %
300
Set, maximum inch
.375
Tensile stress, (200% elongation, minimum psi)
300
Tear resistance, minimum lb-in
25
After 95 ± ½ hour oxygen bomb aging at 70°C:
Tensile strength, minimum % of original
75
Elongation, minimum % of original
65
After 168 ± 1 hour air oven aging at 70°C:
Tensile strength, minimum % of original
75
Elongation, minimum % of original
65
Ozone resistance (after air oven conditioning and
168 ± 1 hour in ozone) at 100°F
no visible cracks
Brittleness temperature, unaged, max. °C
-55
After aging, max. °C
-55
Torsional stiffness ratio, max
10
Cold tension recovery, minimum % at -55°C
20
B.2.10 Jacketing compound, type JR low temperature, natural rubber.
Unaged:
Tensile strength, minimum psi
2000
Elongation, minimum %
350
Set, maximum inch
.250
After 95 ± ½ hour oxygen bomb aging at 70°C:
Tensile strength, minimum % of original
65
Elongation, minimum % of original
65
Ozone resistance (after air oven conditioning and
168 ± 1 hour in ozone) at 100°F
no visible cracks
Brittleness temperature, unaged, max. °C
-55
After aging, max. °C
-55
35
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