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DESCRIPTION
Polyurethane is a unique material that offers the elasticity of rubber combined with the toughness and durability of metal. Because urethane is available in a very broad hardness range (eraser-soft to bowling-ball-hard), it can replace rubber, plastic or metal while providing improved abrasion resistance and physical properties.
Urethanes have better abrasion and tear resistance than rubbers, while offering higher load bearing capacity. When compared to plastics, urethanes offer superior impact resistance, while offering excellent wear properties and elastic memory.
Urethanes have replaced metals in sleeve bearings, wear plates, sprockets, rollers, and various other parts, with benefits such as weight reduction, noise abatement and improved wear resistance.
ADVANTAGES
| - Abrasion resistance |
| Polyurethanes often outwear other material (rubber, plastics and metal) by many times in many applications when severe abrasion is a factor. |
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| - Oil and solvent resistance |
| Polyurethane has excellent resistance to oils, solvents, fats, greases, and gasoline. |
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| - Load bearing capacity |
| Polyurethane has a higher load-bearing capacity than any conventional rubber. Because of this characteristic, it is an ideal material for load wheels, heavy duty couplings, metal-forming pads, shock pads, expansion joints, and machine mounts. |
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| - Tear resistance |
| The tear-strengths of various Polyurethanes range from 100 to 1000 lbs./linear inch, which is far superior to rubbers. As a result, urethane is often used as drive belts, diaphragms, roll covers, cutting pads, gaskets, and chute liners. |
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| - Weather resistance |
| Polyurethane has outstanding resistance to oxygen, ozone, sunlight, and general weather conditions. |
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| - Noise abatement/reduction |
| Hard urethanes are now being used as gears in products where sound reduction is desired. The soft urethanes are used to replace rubbers for improved sound/vibration dampening. |
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| - Flex-Life |
| Most formulations offer extremely high flex-life and can be expected to outlast other elastomer materials where this feature is an important requirement. Dust boots, bellows, diaphragms, belts, couplings, and similar products are made from urethane for this reason. |
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| - Electrical properties |
| Polyurethane has excellent electrical insulating properties and is used successfully in many molded wire and cable harness assembles. |
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| - Heat and cold resistance |
| Continuous use above 225°F is not recommended nor is urethane recommended in hot water over 175°F. At low temperatures, polyurethane will remain flexible down to -90°F. A gradual stiffening will occur at 0°F, but will not become pronounced until much lower temperatures are reached. |
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| TYPICAL PROPERTIES OF POLYURETHANES |
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MECHANICAL PROPERTY |
ASTM TEST |
85A |
95A |
Tensile Properties |
Break, psi |
D412 |
6,000 |
5,500 |
100% modulus, psi |
D412 |
600 |
1,800 |
300% modulus, psi |
D412 |
1,500 |
4,000 |
Elongation, % |
D412 |
500 |
320 |
Break Set, % |
D412 |
10 |
10 |
Modulus of Elasticity, psi |
D638 |
25 |
90 |
Compression Properties (Shape factor 0.56) |
Deflection, psi @ 5% |
D575 |
180 |
450 |
Deflection, psi @ 10% |
D575 |
390 |
890 |
Deflection, psi @ 15% |
D575 |
560 |
1,170 |
Deflection, psi @ 20% |
D575 |
690 |
1,400 |
Deflection, psi @ 25% |
D575 |
800 |
1,600 |
Compression Set, % |
Method A @ 70° C |
D395 |
5 |
1 |
Method B @ 70° C |
D395 |
25 |
40 |
Durometer, Shore ± 5 |
D2240 |
85A |
95A |
Tear Properties, pli, Die C |
D624 |
400 |
450 |
Abrasion Resistance, Tabor |
H18 @ 1000 gm load, mg. loss/1000 cycles |
C501 |
40 |
40 |
Specific Gravity |
D792 |
1.26 |
1.15 |
Base |
- |
Ester |
Ester |
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Note: The information contained herein are typical values intended for reference and comparison purposes only. They should NOT be used as a basis for design specifications or quality control.
All values a 73°F (23°C) unless otherwise noted.
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