AM Au-4 Gold Brazing Alloy is used on ferrous, non-ferrous, and super alloys. Known as the “Cadillac of Braze Alloys”, AM Au-4 primary applications include brazing of aero-engine components (heat exchangers), and aircraft fuel systems (nozzles and elliptical spray bars). AM Au-4 alloy is also heavily used in electron tubes, vacuum tubes, and wave guides in the electronic industry. Uses also include medical applications, carbide, tube fabrication, and anywhere a critical braze joint is required. Compare With: AMS 4787 Rev. H, Orobraze 950, Premabraze 131, NIORO, Gold Braze 8218, UNS: P00820. B20L1A