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.
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.
Hard solid plastics are used in most electronic instruments as well as in structural and automotive parts.
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.
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.
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.
Polyurethanes perform very well when used in high flex fatigue applications. Flexural properties can be isolated allowing for very good elongation and recovery properties.
Polyurethanes possesses high tear resistance along with high tensile strength.
For applications where severe wear prove challenging, polyurethanes are an ideal solution even at low temperatures.
Polyurethane’s material properties will remain stable (with minimal swelling) in water / oil / grease. Polyurethane compounds will last many years in underwater applications.
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.
Polyurethanes exhibit good electrical insulating properties.
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 – 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.
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