The material of DP4 bushing is similar with DU bushing. According to the material is different, the color of inner layer is red. DP4 bushing has good wear and friction performance over a range of loads, speeds and temperature conditions. DP4 bushing has a very good performance in oil lubricated heavy duty hydraulic application. DP4 bushing offers benefits in applications where corrosion of the lead in DU may occur. DP4 offers improved wear and friction performance along with good chemical resistance compared to DU. It is applied to the forming machines, office equipment, medical and scientific equipment, packaging equipment, pneumatic and hydraulic cylinders, pumps and motors, railroad and tramways, textile machinery, valves, etc.