AM BCuP-4 6% Silver is a versatile and effective silver-copper-phosphorus brazing alloy that is primarily used in copper to copper braze joints in HVAC Markets. AM BCuP-4 can be used with other copper-based alloys such as brass or bronze. AM BCuP-4 has a lower melting point than most BCuP alloys and works very well in narrow joint clearances.
AM BCup-4 does NOT require a flux when brazing copper because the phosphorus within the braze alloy. Along with a reducing torch flame, AM BCUp-4 creates an extremely strong hermetically sealed braze joint that is stronger than the copper itself. AM BCuP-4 has a long melting range (200°F) and can have a “Liquation Effect” where low and high melting constituents of the braze filler metal separate due to improper heating. To avoid this phenomenon, it is recommended to rapidly heat assembly to and above the brazing temperature. A minimum brazing temperature of 1435°F (780°C) is recommended. AM BCuP-4 will require a low temperature brazing Flux in almost all applications other than copper to copper brazing.
AM BCuP-4 conforms to American Welding Society (AWS) A5.8/A5.8M 2019: BCuP-4
Rods, Wire, Atomized powder, Paste, and Preformed shapes.
Lucas Milhaupt: Sil-Fos 6
Prince Izant: SilverPhos 6HP
Harris: Stay-Silv 6HP
- Brazing Temperature Range High: 1600°F / 815°C
- Brazing Temperature Range Low: 1525°F / 830°C
- Liquidus: 1499°F / 815°C
- Solidus: 1190°F / 643°C
- Ag: 6%
- Cu: 86.8%
- P: 7.2%