#B-72 is the eutectic composition of the silver-copper system. It is suitable for use in a controlled atmosphere brazing without the use of a paste flux. When molten, #B-72 is very fluid and may flow out over the work surfaces during some furnace brazing applications. The wetting action on ferrous metals is limited, minimizing its use on carbon steel. Improved wetting observed when furnace brazing of stainless steel with silver-copper brazing alloys. Most applications for this alloy are on copper and nickel base alloys.


Melting Pt. 1435 ºF
780 ºC
Flow Pt. 1435 ºF
780 ºC
MBT1 1650
AWS A5.8 BAg-8
AMS 4772
Resale Options Brazing Paste 
Brazing Rod 
Brazing Strip 
Brazing Wire
Preform Options Brazing Discs 
Brazing Rings 
Brazing Washers 
Custom Designs 
Approx. Wire Length (BCuP/lb.) (BAg/Tr.oz) 250 in; 0.031 diameter
28 in; 0.093 diameter 
60 in; 0.062 diameter

Physical Constants

Solidus 1435 ºF
779 ºC
Liquidus 1435 ºF
779 ºC
Brazing Range 1435 to 1650 ºF
779 to 899 ºC
Specific Gravity 9.06
Density 5.24 T.oz./cu.in.
Electrical Conductivity 87.0 % IACS
Electrical Resistivity 2.00 Micro ohm-cm
Color White


Typical applications are the brazing of ferrous, nonferrous, and dissimilar metals and alloys with close joint clearances.

Good for atmosphere and vacuum furnace brazing of ferrous and non ferrous. Used in critical electronic and aerospace brazements.

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 American National standard (ANSI) Z49.1, "Safety in Welding and Cutting." For more complete information, refer to the Material Safety Data Sheet for #B-72.


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: BAg-8
  • Lucas: Silvaloy 720
  • Morgan/Wesgo: Cusil
  • PI: Silver Braze 72
  • UNS: P07720


  • Brazing Temperature Range High: 1535 F / 835 C
  • Brazing Temperature Range Low: 1435 F / 779 C
  • Liquidus: 1435 F / 779 C
  • Solidus: 1435 F / 779 C



  • Ag: 72%
  • Cu: 28%

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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