We are offering dry bushes and washers. Technical details these are steel backed bronze impregnated bushes mainly used for high load application upto 250 nmm2 and temperature upto +280â° c. Mdu is a composite material consisting of three layers viz., steel backing (low carbon steel), a porous bronze (90% cu & 10% sn) sintered matrix, overlaid with a mixture of ptee (poly tetra fluro ethylene) and lead. Steel backing provides the underlying strength while porous bronze sintered layer provides the strong mechanical bond for the impregnated pteelead mixture.