What Are The Kinds of Poly Suspension Bushings?
Along with the density of the polyurethane used, there are different colors (red, black, blue, green, etc are all plausible) and different mixtures. Graphite impregnated polyurethane bushings are just what they say they are. This name is intuitive; the bushing actually has little bits of graphite inside of it. The graphite mixture inside the bushing is supposed to be self-lubricating and prevent the bushing from squeaking as the suspension moves through its range of motion. This helps because the polyurethane in the bushings actually does not ‘twist’ like rubber bushings do; rather, they actually pivot on an inner sleeve lubricated with a special grease.
