The Sil-Fos 0 (BCuP-2) brazing rod is a binary alloy composed primarily of copper and phosphorus, designed specifically for the joining of copper and copper alloys. This 3.2mm (approx. 1/8 inch) diameter rod is supplied in a bulk 25lb tube, making it an ideal inventory staple for high-volume industrial brazing operations, particularly in the HVAC and plumbing sectors. The inclusion of phosphorus in the alloy matrix serves a dual purpose: it lowers the melting point of the copper to a workable brazing range and acts as a deoxidizing agent. This unique chemical property allows the alloy to be self-fluxing when applied to pure copper base metals, eliminating the need for separate flux application and post-braze cleaning.
Metallurgically, Sil-Fos 0 exhibits a melting range with a solidus of approximately 1310°F (710°C) and a liquidus of 1475°F (802°C). This range provides the operator with a specific plastic range where the alloy is semi-molten, allowing for manipulation and capping of joints, although it is generally characterized by its high fluidity. It is engineered to flow quickly into tight capillary spaces (joint clearances of 0.001" to 0.003" are recommended for optimal strength). While it contains 0% silver, the copper-phosphorus bond provides excellent electrical conductivity and corrosion resistance, making it suitable for electrical connectors as well as fluid transport systems.
It is critical to note that this alloy should not be used on ferrous metals (steel, iron) or nickel alloys, as the phosphorus can form brittle intermetallic compounds (phosphides) at the interface, leading to joint failure. When brazing brass or bronze, a separate flux is required to dissolve the zinc oxides formed during heating. The 3.2mm diameter offers substantial alloy deposition per pass, suitable for larger pipe diameters and structural copper fittings found in commercial refrigeration and industrial heat exchangers.
| Additional Information |
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| Diameter (mm):3.2mm (1/8") |
| Packaging Description:25lb tube |
| Silver Content (%):0% |
| AWS Classification:BCuP-2 |
| Material Composition:Copper, Phosphorus |
| Rod Type:Brazing Rod |
| Melting Range:710°C - 802°C |
| Flux Requirement:Self-fluxing on Copper |
