Applications

Polyurethane comes in a plethora of ranges in
terms of its density, flexibility, and toughness.
Each type of polyurethane is used for specific
purposes, which are listed below:

DENSITY

Less dense and flexible polyurethane foam is known for its useful properties including its resistance to water and chemicals; ability to absorb energy; cushioning properties; and buoyancy. Because of these, it’s mainly used in upholstery, auto and truck seating, and bedding.

FLEXIBILITY

Polyurethane products called elastomers are used in rollers such as print rollers, paper creasing rollers, glass fiber cutting rollers, conveyor rollers, and other similar products because of its soft solid characteristics.

TOUGHNESS

Hard solid plastics are used in most electronic instruments as well as in structural and automotive parts.

Versatile Elastomer

Polyurethane is also an extremely versatile elastomer used in
countless applications worldwide. Polyurethanes mechanical
properties can be isolated and manipulated through creative
chemistry which allows specific blends tailored to provide physical
properties which are mentioned below.

Hardness

Elastomers can be created ranging from Shore A Hardness 20 to Shore D Hardness 85. Custom O rings and seals used throughout the industry are made from Polyurethane because of the wide range of available hardness.

Load Bearing Capacity

Polyurethane has a high load capacity in both tension and compression. Polyurethane may undergo a change in shape under a heavy load, but will return to its original shape once the load is removed with little compression set in the material when designed properly for a given application.

Wide Resiliency Range

Resiliency is generally a function of hardness. For shock-absorbing elastomer applications, low rebound compounds are usually used i.e. resilience range of 10-40%. For high frequency vibrations or where quick recovery is required, compounds in the 40-65% resilience are used. In general, toughness is enhanced by high resilience.

Flexibility

Polyurethanes perform very well when used in high flex fatigue applications. Flexural properties can be isolated allowing for very good elongation and recovery properties.

Tear Resistance

Polyurethanes possesses high tear resistance along with high tensile strength.

Abrasion & Impact Resistance

For applications where severe wear prove challenging, polyurethanes are an ideal solution even at low temperatures.

Resistance to Water, Oil & Grease

Polyurethane’s material properties will remain stable (with minimal swelling) in water / oil / grease. Polyurethane compounds will last many years in underwater applications.

Strong Bonding Properties

Polyurethane bonds to a wide range of materials during the manufacturing process. These materials include others plastics, metals and wood. This property makes Polyurethane an ideal material for wheels, rollers and inserts. Polyurethane is also commonly used as an aesthetic overmould to provide soft gripping surfaces and shock resistance on products like toothbrush handles and power tool enclosures.

Electrical Properties

Polyurethanes exhibit good electrical insulating properties.

Advantages of Cast Polyurethane

  • Excellent Impact, Abrasion, Cut, and Tear resistance.
  • Typically out-perform mild steel up to 10X in abrasive applications.
  • Typically out-perform rubber compounds up to 4X in abrasive applications.
  • Superb resilience with exceptional elastomeric memory.
  • Have very high load bearing capabilities.

 

  • Great materials for dampening sound and vibrations.
  • Wide working Temperature range (-30°C to +100°C)
  • Good to Excellent UV and Hydrolytic stability.
  • Excellent dynamic properties for severe flex fatigue applications.
  • Non marking on nearly any surface.
  • Permanently bonds to metal, wood and other structural elements and substrate.
  • A wide array of colors is available.
  • Dual Durometer parts are easily made to gain different properties within one part.
  • Economical for prototypes and low volume production.
  • Good electrical insulating properties.

Superiority of Polyurethane

Compared to Rubber

Polyurethanes display much better physical properties than rubber. They have a higher load-bearing capacity and improved compression set, superior abrasion, cut, and tear resistance, better tolerance to greases, oils, oxygen and ozone, longer life, especially in outdoor or extreme environments, harder durometer ranges without sacrificing performance

Compared to Metal

Compared to Metal – Polyurethane weighs less, is easier to handle, generates far less noise during productions, and can typically outlast some metals by up to three times more in many conditions Polyurethane offers superior abrasive and wear resistance when compared to metal in corrosive environment, is cheaper to manufacture, without the need for welding, machining or other expensive processes. Polyurethanes can be semi-conductive for electrostatic dissipation or transferring a charge.

Compared to Plastic

Polyurethane is more resilient and allows it to return to its original shape when stretched, bent or deformed, it has outstanding impact and abrasion resistance and displays superior durability and resiliency at harder durometers compared to plastic. Plastic cannot manage the same heavy loads that polyurethane can, nor can it reduce noise like polyurethane. Its physical properties can be engineered to meet demanding specifications