Aerospace Material Specification 4770 is silver alloy BAg-1a in welding wire, welding rod, powder, and paste.

BAg-1a is a brazing filler metal that is free-flowing with higher fluidity. This alloy can be used on most iron, copper and nickel-based alloys. Due to its narrow melting range this filler metal is less sensitive to the heating rate and therefore should not separate into low/high melting constituents. 

Ag: 50% | Cd: 18% | Zn: 16.5% | Cu: 15.5%

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