Product Specifications


AM Au-1 Gold Brazing Alloy is used on most ferrous and non-ferrous alloys, and provides an extremely ductile, high-strength braze joint. AM Au-1 primary applications include brazing of electron tubes, vacuum tubes, and wave guides in the 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-1 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-1 is less ductile than other gold/copper filler metals containing nickel (BVAu-3). A minimum brazing temperature of 1,925 °F (1052°C) is recommend for furnace and vacuum applications and AM Au-1 is not recommended without a protective cover or shielding gas.


Properties of Brazed Joints

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



AM Au-1 conforms to the following specifications: AWS A5.8 2019: BAu-1


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:

  • AWS: BAu-1
  • EN: AU 103
  • ISO: Au 375
  • Lucas: Premabraze 399
  • PI: Gold Braze 3762
  • UNS: P00375

Alloy Details

  • Brazing Temperature Range High: 1955 F / 1070 C
  • Brazing Temperature Range Low: 1915 F / 1045 C
  • Liquidus: 1840 F / 1005 C
  • Solidus: 1805 F / 985 C 

Nominal Composition

  • Au: 37.50%
  • Cu: 62.50%