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NAK - Polyurethane Seals
Polyurethane Advantages
Polymer Comparison
*Ratings: E – Excellent, G – Good, F – Fair, P - Poor
| Property / Material |
Urethane
(PU) |
Neoprene |
Nitrile |
Natural Rubber |
EPDM |
Viton ® |
| Tensile Strength |
E |
G-E |
F |
G-F |
F |
P |
Hardness Range
Shore A |
93 |
10-95 |
20-100 |
30-100 |
25-90 |
60-90 |
| Max. Service Temp. |
100 |
120 |
120 |
100 |
100 |
205 |
| Ozone Resistance |
E |
F-G |
P |
P |
E |
E |
| Cut Resistance |
E |
G |
F |
G |
F |
P |
| Tear Strength |
E |
G |
F |
G |
F |
P |
| Compression Set |
F-G |
G |
F-G |
F |
G |
G |
| Abrasion |
E |
G-E |
F |
G |
F |
G |
Chemical Resistance
*Ratings: E – Excellent, G – Good, F – Fair, P - Poor
| Property / Material |
Urethane (PU) |
Neoprene |
Nitrile |
Natural Rubber |
EPDM |
Viton ® |
| ASTM #1 oil |
E |
F-G |
E |
P |
P |
E |
| Fuel B |
E |
F |
G-E |
P |
P |
E |
| Toluene |
E |
P-F |
G |
P |
P |
E |
| Hexane |
E |
G |
E |
P |
P |
E |
| Isopropyl Alcohol |
G |
G-E |
G-E |
E |
E |
E |
| Water – 25 |
G |
G |
G |
E |
E |
E |
| Water – 100 |
F |
G |
G |
G-E |
E |
E |
| Caustics:
10% NaOH |
P |
G-E |
G-E |
E |
E |
E |
Acids:
10% H2SO4 |
P |
G-E |
G-E |
E |
E |
E |
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Viton ® is a registered trademark of DuPont Performance Elastomers
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