BS1400: PB1 / CC481K is the standard grade of phosphor bronze or tin bronze used. Essentially a 10-12% tin containing copper alloy it has a small phosphorus content added to increase fluidity and de-oxidise the material during casting.
The high tin content of the PB1 / CC481K imparts a very good corrosion resistance in marine environments and brine, while also improving the strength and wear resistance. It also offers a good resistance to shock loading although the wrought grades can out-perform the PB1 in this area. PB1 / CC481K can be soldered and brazed and has traditionally been utilised in the manufacture of pump and valves, gears, worm wheels, bushes and bearings for medium to heavy loading at high speed.
Chemical Composition Copper
0.2% Proof Strength
Very good marine corrosion resistance
High wear resistance
High resistance to shock loading