The Phosphorus Copper alloys are extensively used to join copper and copper alloy base metals (brass, bronzes). Phos-Copper is extensively used in Non-Ferrous Industry. They have self-fluxing properties when used on copper and may or may not contain Silver. Continuous service operating temperatures of joints brazed with these alloys range up to approx 200 °C. Corrosion resistance is satisfactory, except when the joints are exposed to sulfurous environments, especially at elevated temperatures. Phosphorous Copper alloys should not be used on ferrous, nickel based alloys, or copper-nickel alloys with more of 10% nickel, in order to avoid premature failure of the joint due to the formation of brittle intermetallic phases.
| Standard | Alloy | Chemical Composition(%) | Solidus | Liquidus | Application |
| AWS A5.8 | BCuP-2 | Cu:Balance P:6.5-7.5 Other:0.05 | 710℃ | 820℃ | Copper and phosphorous alloy offering excellent liquidity for tight fitting joints. Used extensively in the HVAC industry to make preform rings for evaporator. |
| AWS A5.8 | BCuP-3 | Cu:Balance P:5.7-6.1 Ag:4.9-5.1 Other:0.05 | 643℃ | 816℃ | Delivers moderate liquidity and improved gap filling compared to PhosCopper 0. The 5% silver content provides good economy when compared with PhosCopper. |
| AWS A5.8 | BCuP-5 | Cu:Balance P:4.8-5.3 Ag:14.5-15.5 Other:0.05 | 645℃ | 800℃ | This is very popular alloy offers superior ductility and strength. it is suitable for wide gap applications. Joint clearances of 0.002-0.006". Easy to use,good control. Used extensively in copper tube joining applications. |
| AWS A5.8 | BCuP-6 | Cu:Balance P:6.8-7.5 Ag:1.8-2.2 Other:0.05 | 645℃ | 825℃ | Combination of low silver with high phosphorous creates very good fluidity. While not quite as liquid as BCuP-2,tight fit-up is recommended. |
| - | BCu86PSn | Cu:Balance P:6.0-7.0 Sn:6.0-7.0 Other:0.05 | 637℃ | 674℃ | Excellent combination of strength, cold formability and hardness. It is wear resistant, has good corrosion resistance and soldering properties. |
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