Best Type of Rubber
Properties |
Ethylene Propylene Dienne |
Nitrile Rubber |
Polychloroprene |
Natural Rubber |
ASTM Designations |
EPDM |
NBR |
CR |
NR |
Durometer (Shore A) |
40 - 90 |
40 - 90 |
40 - 90 |
30 - 90 |
Specific Gravity (Polymer) |
0.86 |
1.00 |
1.24 |
.92 |
Tensile Strength Max-psi (MPA) |
2000 (13.8) |
2500 (17.3) |
2500 (17.3) |
3500 (24.1) |
Low Temperature Brittle Point |
-70°F (-58°C) |
-60°F (-51°C) |
-65°F (-54°C) |
-70°F (-58°C) |
Resilience |
G to E |
G |
G to E |
E |
Compression Set |
G |
G |
F to G |
G |
Heat Aging |
E |
G |
G |
F |
Abrasion Resestance |
G |
G |
G |
E |
Tear Strength |
P |
F |
G |
E |
Flame Retardant Properties |
P |
P |
G |
P |
Weathering Characteristics |
E |
F to P |
G to E |
P |
Oxidation Resistance |
E |
G |
G to E |
G |
Ozone Resistance |
E |
F |
G to E |
P |
Oil Resistance |
P |
E |
G |
P |
Acid Resistance |
E |
G |
G to E |
F to G |
Alkali Resistance |
E |
G |
G to E |
F to G |
Key Characteristics/Comments |
Ozone resistance, good Extendibility |
Oil and fuel resistance |
Flame & weather resistance |
Tensile strength & tear resistance |
Properties |
Polyisoprene |
Styrene Butadiene Rubber |
Butyl Rubber |
Polybutadiene |
ASTM Designations |
IR |
SBR |
IIR |
BR |
Durometer (Shore A) |
30 - 90 |
40 - 90 |
40 - 80 |
40 - 80 |
Specific Gravity (Polymer) |
0.92 |
0.94 |
0.92 |
0.93 |
Tensile Strength Max-psi (MPA) |
3000 (20.7) |
2500 (17.3) |
2000 (13.8) |
2000 (13.8) |
Low Temperature Brittle Point |
-70°F (-58°C) |
-70°F (-58°C) |
-70°F (-58°C) |
-100°F (-73°C) |
Resilience |
G to E |
G |
P |
E |
Compression Set |
G |
G |
F |
G |
Heat Aging |
F |
F to G |
G to E |
F to G |
Abrasion Resistance |
E |
G to E |
G |
F |
Tear Strength |
G |
F |
G |
G |
Flame Retardant Properties |
P |
P |
P |
P |
Weathering Characteristics |
P |
P |
G to E |
F |
Oxidation Resistance |
G |
F |
E |
F |
Ozone Resistance |
P |
P |
G to E |
P |
Oil Resistance |
P |
P |
P |
P |
Acid Resistance |
F to G |
F to G |
E |
F |
Alkali Resistance |
F to G |
F to G |
E |
F |
Key Characteristics/Comments |
Synthetic natural rubber |
Abrasion resistance |
Low gas permeability BIIR & CIIR offer improved cure characteristics |
Excellent resilience, typically blended with other polymers |