Copper-phosphorous and silver copper-phosphorous brazing alloys are widely used in joining copper to copper in air with fluxless products.
When phosphorous is added to a BCuP alloy, it results in the filler metal self-fluxing on copper based metals.
The addition of silver to copper-phosphorous improves ductility and electrical conductivity in the alloy and it reduces its melting range.
The addition of tin reduces the melting range and improves corrosion resistance. 
The filler metals can be used also to braze brass or bronze with an addition of flux because of the zinc oxides on bronze and brass. 
However, they are not able to be used on ferrous and nickel, and copper-nickels based materials due to the embrittlement possibility. 
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