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BVAg-29 Technical Data


Silver Braze In15 is used in a wide range of moderate temperature low pressure systems, and is found quite often in electronic vacuum tube applications.

Brazing Characteristics

SBIn15 is a low temperature vacuum-grade filler metal which has a tendency to liquate when heated at a slow rate due to its large melt range. SBIn15 is designed for all types of moderate temperature vacuum systems and particularly where maximum precautions must be taken to ensure the presence of only a minimum amount of detrimental volatile impurities. It can be brazed successfully under hydrogen, inert or vacuum atmospheres without the use of flux. The indium content aids in wetting to the surface of ferrous alloys compared to silver-copper-zinc systems.

Properties of Brazed Joints

The properties of a brazed joint are dependent upon the base metal, joint design and brazing technique. For controlled atmosphere brazing or vacuum brazing the recommended radial joint clearance for silver base alloys falls within 0.000in – 0.002in (0.00mm – 0.05mm) range.


SBIn15 alloy conforms to: Unified Numbering System (UNS) P07627 and American Welding Society (AWS) A5.8/A5.8M BVAg-29 Grade 1 and Grade 2.

Available Forms

Wire, strip, engineered preforms, specialty preforms per customer specification, powder and paste.

Compare With

  • AWS: BVAg-29
  • Lucas: Premabraze 616
  • UNS: P07627


  • Brazing Temperature Range High: 1405 F / 763 C
  • Brazing Temperature Range Low: 1355 F / 735 C
  • Liquidus: 1305 F / 707 C
  • Solidus: 1155 F / 624 C



  • Ag: 61.5%
  • Cu: 24%
  • In: 14.5%

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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