Engineered composite plastic bushings have been proven to deliver a longer service life than oil-impregnated sintered bronze bearings and can save users up to 40 percent on maintenance costs.
Plastic bushings have already replaced bronze in thousands of applications from a variety of industries, including agricultural machinery, lawn mowers, medical equipment, food processing machinery, fitness equipment, and pumps and valves.
Oil-impregnated bronze bearings rely on a capillary action to create a lubricating oil film. High speed and rotational motion are both required to draw the oil out and maintain a full film of lubricant. Shaft oscillation, slow speed and intermittent use can all inhibit this process.
If movement stops, the oil on the surface of the bearing dries up. This can lead to squeaking and an increase in the coefficient of friction. High temperatures can also break down the oil. Other disadvantages include low chemical resistance and sensitivity to dirt, edge pressure and impacts.