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Silverphos 2 Technical Data


Silverphos 2  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

Silverphos 2 is a copper-rich, intermediate temperature,  brazing filler metal that is free flowing and self-fluxing on copper by virtue of its phosphorus content. This alloy is extremely fluid when heated rapidly to its flow point and will penetrate joints with very little clearance. Best results are obtained with joint clearances of 0.001in. – 0.003in. (0.025mm – 0.075mm). Silverphos 2 liquates (separates into high and low melting constituents) if heated slowly through its melting range. The self-fluxing property of Silverphos 2 is effective on copper only. Copper base alloys, such as brass or bronze, may be brazed with Silverphos 2 but cannot be used on ferrous metals or nickel base alloys, cince the phosphorus produces brittle iron or nickel phosphorus 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 Silverphos 2 are entirely satisfactory on copper and soft 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 alloy may be preferred, particularly if the joints are to be subjected to impact or vibration in service. 


Silverphos 2 alloy conforms to: American Welding Society (AWS) A5.8/A5.8M BCuP-6

Available Forms

Wire, rod, limited engineered preforms, limited specialty preforms per customer specification, powder and paste

Compare With

  • AWS: BCuP-6
  • Lucas: Sil-Fos 2
  • UNS: C55280


  • Brazing Temperature Range High: 1550 F / 843 C
  • Brazing Temperature Range Low: 1500 F / 816 C
  • Liquidus: 1450 F / 788 C
  • Solidus: 1190 F / 643 C



  • Cu: 91%
  • P: 7%
  • Ag: 2%

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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