Combination of low silver with high phosphorous creates very good fluidity in this phos-copper brazing alloy. While not quite as liquid as #0, tight fit-up is recommended.

#2 is used for the brazing of copper and copper alloys, brass and bronze. It can also be used on silver, tungsten and molybdenum. It is primarily used for the joining of copper-to-copper on vibration free joints. It is very effective for joining tight fitting copper pipe and tubing. #2 should not be used when brazing ferrous metals or copper alloys containing more than 10% nickel because of phosphorus embrittlement due to reactions with iron or nickel. #2 is extremely fluid at brazing temperatures and will penetrate a joint with very little clearance. Best results are obtained with clearances of 0.001″ – 0.003″. Melting of #2 is virtually complete at 1300ºF (704ºC). Best results are obtained when brazing slightly above this temperature.


Melting Pt. 1190 ºF
645 ºC
Flow Pt. 1300 ºF
705 ºC
MBT1 1475
AWS A5.8 BCuP-6
QQ-B-650 BCuP-6
Preform Options Brazing Rings 
Custom Designs 
Resale Options Brazing Rods 
Brazing Wire 
Approx. Wire Length (BCuP/lb.) (BAg/Tr.oz) 1140 in @ 0.062 diameter 
4570 in @ 0.031 diameter 
500 in @ 0.093 diameter

Physical Constants

Solidus 1190 ºF
643 ºC
Liquidus 1450 ºF
788 ºC
Brazing Range 1300 to 1450 ºF
643 to 788 ºC
Specific Gravity 8.00
Density 4.21 T.oz./cu.in. 0.289 lb./cu.in
Electrical Conductivity 5.5 % IACS
Electrical Resistivity 31.5 Micro ohm-cm
Color Light Copper


The phosphorus content of #2 acts as a fluxing agent and no flux is necessary when brazing copper joints. However, when used with a copper alloy or one of the other brazeable metals, a brazing flux must be used to promote wetting, bonding, and flow throughout the joint. The flow point of #2 is 1300 ºF (704 ºC).

Silver addition lowers solidus temperature, not as fluid as Sil. 0, gap clearance .001" to .003".

Available Forms

Standard forms of #2 are brazing wire and brazing preforms


Download SDS Sheet

Bellman-Melcor distinguishes itself as a provider of premium quality brazing alloys at industry competitive prices. Our extensive inventory of brazing and soldering alloys ensures that in most cases your order can be available for immediate delivery.


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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