Polyurethane is a versatile material available from eraser soft to bowling ball hard and suits a variety of applications from dipper door blocks to deadplate to lubricated bearings. Critical to the properties of the urethane is whether it is polyether or polyester based. The two have different advantages and disadvantages and are suitable for different applications.
Typically used in the softer urethanes, polyester has strong cut and tear resistance combined with better oil and heat resistance than polyether-based materials. Typically the hardness of a polyester urethane is below 90A on the hardness scale, with “A” representing the rubbers. Polyester materials have poor resistance to moisture and have worse low temperature performance than polyether materials. Polyester performs very well in a number of applications including wear and bumper pads, rollers, scrapers and applications involving impingement.
Typically the harder urethanes (above 90A), polyether materials have better moisture resistance and dynamic properties than the polyester urethanes. They also have better low temperature properties. However, polyether materials have less abrasion resistance and are more likely to tear. Proven applications involving polyether based urethanes include bearings, idler rollers, elevator wheels and sprockets.
A full list of available Redco™ Polyurethane is available here.
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