General Rubber Sheet

PU Sheet
Updated:11/24/2012 11:14:22 PM Browse:74 Close window Print this page

PU Sheet

1. Oil and solvent resistance

2. Abrasion resistance

3. Noise abatement

4. Flex life

I. 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.

II. ADVANTAGES

Abrasion resistance

Polyurethanes often outwear other materials (rubber, plastics and metal) by many times in many applications when severe abrasion is a factor.

Oil and solvent resistance

Polyurethane has excellent resistance to oils, solvents, fats, greases and gasoline.

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.

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.

Weather resistance

Polyurethane has outstanding resistance to oxygen, ozone, sunlight and general weather conditions.

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.

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.

Electrical properties

Polyurethane has excellent electrical insulating properties and is used successfully in many molded wire and cable harness assemblies.

Heat and cold resistance

Continuous use above 225 degree is not recommended nor is urethane recommended in hot water over 175. At low temperatures, polyurethane will remain flexible down to -90 degree. A gradual stiffening will occur at 0 degree, but will not become pronounced until much lower temperatures are reached.

III. TYPICAL APPLICATIONS

Belts Metal forming pads Wear strips Bumpers Gears Bellows Machinery mounts Cutting Surfaces Sound-dampening pads Chute and hopper liners Prototype machined parts Gaskets Seals Rollers Roller covers Sandblast curtains Diaphragms
 

 

 

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