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Five Important Facts about Polyurethane Caster Wheels in the Heavy Duty Industrial Caster Application


Poly Wheel Caster by Caster Conceptss

The advent of polyurethane nearly 50 years ago has had an impact on many industries and product lines. One area that it has impacted significantly is the manufacture of heavy duty industrial casters and wheels. Approximately 80 percent of all heavy duty applications require a polyurethane tire applied to a wheel core. The quality of the material and process is what assures a long life cycle of the product.

I would like to share with you five important facts that you must consider when utilizing polyurethane tired wheels in your industrial applications. If you consider these facts you will likely have a good experience with polyurethane wheels.

Heat is Enemy #1 of Polyurethane Wheels. Polyurethane is a very tough material when used in the proper fashion. However, when used in either high environmental heat applications or applications that generate heat, durability of the polyurethane will be compromised significantly. Most common urethane will not withstand ambient heat above 230 degrees for any longer than 60-90 minutes without causing damage. Internally generated heat (by cyclic deflection of the urethane) in the 250 degree range will liquefy the material within 15 minutes.

Polyurethanes are not all equal– Polyurethane used in industrial applications must have properties that exceed the properties of most urethanes used in non-dynamic applications. One must consider the following in order to get the proper urethane to meet your needs.

a) Tear strength

b) Tensile strength

c) Modulus

d) Abrasion Resistance

Hot Casted Urethane is the only way to produce an industrial wheel. Urethanes that are hot cast (poured at heat levels of 140-170 F and cured in the range of 190-240 F) produce a superior wheel for demanding dynamic applications. Urethanes that are processed and cured at room temperature seldom deliver the physical properties that are needed in an industrial wheel application.

Hidden Manufacturing Defects are the most common mode of failure-The common point of failure of the industrial polyurethane wheel is the point where the urethane and the core (steel or cast iron) must be bonded to support dynamic application of the wheel. Without proper preparation of the core, proper cleansing of the prepared surface, proper application of the bonding agent, and proper preheating of the core, the probability of premature failure of the bond and wheel increases significantly. None of these defects can be seen at the time you receive your wheel and put it into application. Choose a manufacture that follows a quality procedure and is ISO 9001-2000 certified.

Modern Meter Mix Machinery assure the proper mix ratio– The ratio of the isocyanates to the curing agent is a critical part of the manufacture of the desired end product. Improper mixture of the two parts will lead to a material that might appear to be correct but will never perform in the way that it was designed. Stoichiometry is the measurement of the ratio of the two components and at times when wheel failures occur can be tested in the final product to determine a mode of failure. Today there are many very modern machines that are equipped with high tech metering systems and mixers that make the manufacture of a standard stoichiometry mixture a consistent outcome.

Caster Concepts, Inc. and Reaction Industries, LLC provide the highest quality urethanes produced with the most modern equipment to meet the most difficult polyurethane wheel needs. With mechanical engineering and polymer engineering support you will not be disappointed.

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