Developed especially for use as a brazing preform alloy, the phosphorous content delivers good liquidity while the silver improves ductility.


Melting Pt. 1190 ºF
643 ºC
Flow Pt. 1325 ºF
718 ºC
MBT1 1450
AWS A5.8 BCuP-4
Preform Options Brazing Discs 
Brazing Rings 
Brazing Shims 
Brazing Washers 
Custom Designs 
Resale Options Brazing Rods
Brazing Wire 
Approx. Wire Length (BCuP/lb.) (BAg/Tr.oz) 1120 in; 0.062 diameter 
4500 in; 0.031 diameter
490 in; 0.093 diameter

Physical Constants

Density 4.29 T.oz./cu.in. 
0.294 lb./cu.in
Color Light Copper


Reasonably fluid, similar to Sil. 0 in joint clearance of .001" to .003". Ideal flow as brazing preform.

Safety Information

It is essential that adequate ventilation be provided so that personnel will not inhale gases and fumes while brazing. The operation and maintenance of brazing equipment or facility should conform to the provisions of ANSI/ASC Z49.1, "Safety in Welding, Cutting, and Allied Precision." For more complete information, refer to the MSDS for BrazeIt 6F.


Download SDS Sheet

Compare With

  • AWS: BCuP-4
  • Lucas: Sil-Fos 6
  • UNS: C55283


  • Brazing Temperature Range High: 1425 F / 774 C
  • Brazing Temperature Range Low: 1375 F / 746 C
  • Liquidus: 1325 F / 718 C
  • Solidus: 1190 F / 643 C



  • Cu: 86.75%
  • P: 7.25%
  • Ag: 6%

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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