Product Specifications


AM Au-25 Gold Brazing Alloy is used on most ferrous and non-ferrous alloys, and provides an extremely ductile, high-strength braze joint. AM Au-25 primary applications include brazing of electron tubes, vacuum tubes, and wave guides in electronic industry. Uses also include hermetic seals, metallized ceramics, ceramic to metal seals, glass to metal seals, and multiple step-brazing applications. 


Brazing Characteristics 

AM Au-25 Gold Brazing Alloy can be successfully brazed onto a wide range of high temperature applications like microwaves, satellites, wave guides, klystron tubes, medical equipment, solid state power amplifiers, pressure windows, power transmitters, and laser assemblies. AM-Au-25 is less ductile than other gold/copper filler metals containing nickel (BVAu-3). A minimum brazing temperature of 2180°F (1194°C) is recommend for furnace and vacuum applications and AM-Au-25 is not recommended without a protective cover or shielding gas. 



AM Au-25 conforms to the following specifications: American Welding Society (AWS) A5.8:2019 Standards. +/- 0.5% on Au Content, Balance Copper 


Forms Available 

Wire, Foil, Atomized powder, Paste, Sheet, and Preformed shapes; rings, washers, discs, shims, specialty shapes. Two dimensional shapes can be Laser-cut and machined with EDM though parts must be cleaned prior to brazing. 


Compare With: 

  • Morgan/Wesgo: 25Au/75Cu
  • Prince Izant: Gold Braze 2575 

Alloy Details 

  • Brazing Temperature Range High: 2230°F 1221°C
  • Brazing Temperature Range Low: 2180°F 1194°C
  • Liquidus: 2160°F 1182°C
  • Solidus: 2105°F 1152°C 

Nominal Composition 

  • Au 25% 
  • Cu 75%