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Phoscopper 0 Technical Data


Phoscopper 0 is a low cost brazing filler metal suitable for joining copper to copper and copper to copper alloys where critical impact or vibration stresses are not encountered in service. It should only be used on assemblies where good fit-up can be maintained.

Brazing Characteristics

Phoscopper 0 is a copper rich, intermediate temperature, brazing filler metal that is free flowing. This alloy is extremely fluid when heated rapidly to its flow point and will penetrate joints with very little clearance. Phoscopper 0 can withstand moderate vibration and is not very ductile. Best results are obtained with joint clearances of 0.001in-0.003in. (0.025mm – 0.075mm). Phoscopper 0 liquates (separates into high and low melting constituents) if heated slowly through its melting range. The self-fluxing property of Phoscopper 0 is effective on copper only. Copper base alloys, such as brass or bronze, may be brazed with the use of flux. Phoscopper 0 should not be used on ferrous metals or nickel base alloys, since the phosphorus produces brittle iron or nickel phosphides at the joint interface.

Properties of Brazed Joints

The properties of a brazed joint are dependent upon numerous factors including base metal properties, joint design, metallurgical interaction between the base metal and the filler metal. Joints made with Phoscopper 0 ae entirely satisfactory on copper and copper alloys if good fit-up and adequate shear area are maintained. If poor fit-up prevails, or shear area is marginal, a lower phosphorus content silver-copper-phosphorus filler metal may be preferred.

The corrosion resistance of Phoscopper 0 is comparable to that of copper except when exposed to sulfur compounds and sulfur-containing gas or oil, especially at elevated temperatures. Under this conditions Phoscopper 0 undergoes progressive corrosive deterioration, and should not be used.


Phoscopper 0 alloy conforms to: American Welding Society (AWS) A5.8/A5.8M BCuP-2

Available Forms

Wire, powder and paste


Phoscopper 0 is not suitable for larger gaps and should be used only where good fitup can be maintained.

Compare With

  • AWS: BCuP-2
  • UNS: C55181


  • Brazing Temperature Range High: 1560 F / 849 C
  • Brazing Temperature Range Low: 1510 F / 821 C
  • Liquidus: 1460 F / 793 C
  • Solidus: 1310 F / 710 C



  • Cu: 92.75%
  • P: 7.25%

The information and recommendations contained in this publication have been provided without charge & compiled from sources believed to be reliable and to represent the best information available on the subject at the time of issue. No warranty, guarantee, or representation is made by the Prince and Izant Company, Inc. as to the absolute correctness or sufficiency of any representation contained in this and other publications; Prince and Izant Company, Inc. assumes no responsibility in connection therewith; nor can it be assumed that all acceptable safety measures are contained in this and other publications, or that other or additional measures may not be required under particular or exceptional conditions or circumstances. The company and product names referenced herein are for identification purposes only. All trademarks and registered trademarks are the property of their respective owners.

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