Copper-phosphorus and copper-phosphorus-silver alloys are widely used in copper and copper alloy brazing. They can also be used without flux thanks to the presence of phosphorus, with the exception of copper/brass and copper/bronze welds.

The addition of silver guarantees a greater alloy ductility, allows for a reduced melting point and increases electrical conductivity in the alloy.

These brazing alloys are not recommended for use in the presence of steels and alloys with a high nickel content. Otherwise, the joint welding will be very fragile.

SALDFLUX produces two different types of copper-phosphorus alloy. FOS® and SILVERFOS® alloys are for general use, with excellent flowability, while DULLFOS® alloys are highly recommended in the refrigeration sector or where the brazing gap is larger.