Sil-Fos 15 is the preferred alloy for general copper-copper brazing; the phosphorous in the Sil-Fos family serves as a fluxing agent, no flux is recommended. Sil-Fos 15 is the best alloy to use when joining metals where close fit-ups cannot be maintained and is well suited for use in refrigeration applications. Joins CU to CU (phosphorus serves as flux) Joins CU to Brass (flux is recommended) Highest joint ductility of entire Sil-Fos family Slow Flow Made in USA Industry Applications: HVAC Brazing HVAC/R Refrigerant systems, air conditioning coils, evaporator coils. How to Braze Copper Pipe HVAC SIL-FOS 15 Nominal Composition: Silver 15.00, Copper 80.00, Phosphorous 5.00, Liquidus: 1475 °F, 802 °C Solidus: 1190 °F, 643 °C AWS: BCuP-5
