5% Silver, 6% Phosphorus, balance CopperSimilar to 15% silphos with the ability to fill gaps and form fillets without adversely affecting strengthPhosphorus acts as a fluxing agent when joining copper to copper, when joining brass use LENOX Brazing Flux (WS78172)Temperature: Melt 1190° F, Flow 1495° FMeets AWS BCuP-3