15% Silver, 5% Phosphorus, remainder is Copper. This is the best alloy for filling gaps when close fit-ups cannot be made. It also has the highest joint ductility and strength in HVAC-R applications. It meets AWS BCuP-5.Contains 15% silver, 5% phosphorus, remainderBest alloy for filling gaps when close fit-ups cannot be madeHighest joint ductility and strength in HVAC-R applicationsMeets AWS BCuP-5