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BVAg-6b Technical Data


BVAg-6b is generally used to join silver, copper and nickel base alloys in reducing or inert atmospheres or vacuum. It is also widely used to join metallized ceramics to metals in vacuum. BVAg-6b is designed for all types of moderate temperature vacuum systems and particularly where maximum precautions must be taken to insure the presence of only a minimum amount of detrimental volatile impurities.

Brazing Characteristics

BVAg-6b is a silver-copper composition alloy with a wide melting range where better gap filling capabilities may be required. On either silver or copper base alloys, BVAg-6b may exhibit a decreased in fluidity and an increased re-melt temperature due to the solution of either silver or copper in the eutectic. Brazing time and temperature should be minimized to prevent excessive diffusion and erosion of the base metal. This filler metal has limited wetting ability on iron and/on nickel base alloys. The wetting ability it does have is derived from its copper content. Both iron and nickel have practically no solubility in silver, while nickel is readily soluble in copper and the solubility of iron in copper is sufficient to provide wetting. It is an observed fact that the wetting obtained in good hydrogen atmospheres is superior to that derived from flux protection.


Silver Braze 50Cu alloy conforms to: American Welding Society (AWS) A5.8/A5.8M BVAg-6b

Available Forms

Wire, strip, engineered preforms, specialty preforms per customer specification.

Compare With

  • AWS: BVAg-6b
  • Lucas: Silvaloy 503
  • UNS: P07507


  • Brazing Temperature Range High: 1702 F / 928 C
  • Brazing Temperature Range Low: 1652 F / 900 C
  • Liquidus: 1602 F / 872 C
  • Solidus: 1435 F / 779 C



  • Cu: 50%
  • Ag: 50%

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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