Silicon brazing alloys offer significant advantages over phos/copper and silver/phos/copper (BCuP) brazing alloys and present important differences in the brazing of copper and its alloys. The addition of silicon effects such noticeable changes as:

Outstanding ability to form a large shoulder, or cap, at the braze connection
Distinct, favorable color changes in the finished braze alloy
Improved ductility over non-silver-bearing BCuP-2 braze alloys
Easily brazes brass and brass alloys without the addition of silver
Significantly reduces brazing temperatures compared to BCuP braze alloys
The addition of silver further enhances the favorable color change