Copper-Phosphorous brazing alloys are used primarily on copper and copper alloys. These alloys contain phosphorous, which deoxidizes copper and acts as a flux on clean base metals. In most cases, additional flux is still required, however, particularly when working with brass or bronze. Copper Phosphorous alloys are not suitable for use on iron or nickel base alloys as phosphorous can form brittle intermetallic phosphide compounds with iron and nickel. Copper phosphorous alloys have similar corrosion resistance as pure copper, except when exposed to sulfur compounds.
| Name | Specifications Met | Nominal Composition | Solidus | Liquidus | |||||||
| AWS A5.8 | AMS | Ag | Cu | P | Sn | oF | oC | oF | oC | ||
| 0 | 91.5 | 8.5 | 1317 | 714 | 1317 | 714 | INFO | ||||
| This filler metal is a low-cost choice for joining copper and copper-based alloys where the brazed assemblies are not required to withstand vibration or impacts. This filler metal is free flowing and is best suited to joint clearances between 0.001"-0.003". This filler metal will liquate when heated slowly, so it is best used in torch or induction applications where the assembly can be brought to temperature rapidly. | Color: | Dull Gray |
| Specific Gravity: | - | |
| Density: | - | |
| Electrical Conductivity: | -% IACS | |
| Electrical Resistivity: | -mcΩ |
| 0-2 | BCup-2 | 92.75 | 7.25 | 1310 | 710 | 1460 | 793 | INFO |
| This filler metal is a low-cost choice for joining copper and copper-based alloys where the brazed assemblies are not required to withstand vibration or impacts. This filler metal is free flowing and is best suited to joint clearances between 0.001"-0.003". This filler metal will liquate when heated slowly, so it is best used in torch or induction applications where the assembly can be brought to temperature rapidly. | Color: | Dull Gray |
| Specific Gravity: | 7.92 | |
| Density: | 0.289 | |
| Electrical Conductivity: | 7.5% IACS | |
| Electrical Resistivity: | 23.2mcΩ |
| 0-3 | BCup-1 | 95 | 5 | 1310 | 710 | 1695 | 924 | INFO |
| - | Color: | - |
| Specific Gravity: | - | |
| Density: | - | |
| Electrical Conductivity: | - | |
| Electrical Resistivity: | - |
| 0-7 | 86.75 | 6.25 | 7 | 1140 | 616 | 1250 | 677 | INFO |
| This filler metal offers excellent low-temperature melting characteristics in an economical silver-free composition. This filler metal is versatile and will fill small to medium gaps with recommended tolerances of 0.001"-0.005". | Color: | Dull Gray |
| Specific Gravity: | - | |
| Density: | - | |
| Electrical Conductivity: | - | |
| Electrical Resistivity: | - |
| 2 | BCup-6 | 2 | 91 | 7 | 1190 | 643 | 1450 | 788 | INFO |
| This filler metal is a good general purpose brazing alloy for use on copper and copper alloys. It is particularly suited to tight fitting joints with clearances from 0.001"-0.003" as this filler metal is very fluid when molten. Despite a liquidus temperature of 1450oF, this filler metal is almost completely molten at 1350of, so brazing temperatures may need to be adjusted accordingly. | Color: | Pale Red |
| Specific Gravity: | 7.966 | |
| Density: | 4.198 | |
| Electrical Conductivity: | 5.5% IACS | |
| Electrical Resistivity: | 31.5mcΩ |
| 5-0 | BCup-7 | 5 | 88.25 | 6.75 | 1190 | 643 | 1445 | 785 | INFO |
| This filler metal is a versatile choice when brazing copper and copper-based alloys. It is very sluggish when it begins to melt, making it suitable for filling large gaps, or uneven joints. When heated further towards the liquidus temperature, the filler metal becomes quite fluid, which enables it to penetrate deeply into tighter joints. | Color: | Pale Red |
| Specific Gravity: | - | |
| Density: | 4.231 | |
| Electrical Conductivity: | - % IACS | |
| Electrical Resistivity: | - mcΩ |
| 5-1 | BCup-3 | 5 | 89 | 6 | 1190 | 643 | 1495 | 813 | INFO |
| This filler metal is a versatile choice when brazing copper and copper-based alloys. It is very sluggish when it begins to melt, making it suitable for filling large gaps, or uneven joints. When heated further towards the liquidus temperature, the filler metal becomes quite fluid, which enables it to penetrate deeply into tighter joints. | Color: | Pale Red |
| Specific Gravity: | 8.129 | |
| Density: | 4.284 | |
| Electrical Conductivity: | 9.6% IACS | |
| Electrical Resistivity: | 18.1mcΩ |
| 6-0 | BCup-4 | 6 | 86.75 | 7.25 | 1190 | 643 | 1325 | 718 | INFO |
| This filler metal is an excellent choice for joints with larger gaps or uneven gaps because it has slightly sluggish flow characteristics with excellent gap filling and filleting capability. | Color: | Pale Red |
| Specific Gravity: | - | |
| Density: | 0.294 | |
| Electrical Conductivity: | - % IACS | |
| Electrical Resistivity: | - mcΩ |
| 15 | BCup-5 | 15 | 80 | 5 | 1190 | 643 | 1475 | 802 | INFO |
| This is the best general-purpose copper-phosphorous brazing alloy. It offers excellent ductility and electrical conductivity and has flow characteristics that make it suitable for joint clearances from 0.001"-0.005" with excellent gap filling characteristics. | Color: | Pale Red |
| Specific Gravity: | 8.378 | |
| Density: | 4.415 | |
| Electrical Conductivity: | 9.9 % IACS | |
| Electrical Resistivity: | 17.4 mcΩ |
| 17 | 17.75 | 75 | 7.25 | 1190 | 643 | 1190 | 643 | INFO |
| This filler metal is a eutectic composition which makes it a very fluid alloy suitable for filling tight gaps. It is also the copper-phosphorous filler metal best suited for furnace brazing since it has the least tendency to liquate of all the copper-phosphorous alloys. | Color: | Pale Red |
| Specific Gravity: | 8.235 | |
| Density: | 4.340 | |
| Electrical Conductivity: | 6.0 % IACS | |
| Electrical Resistivity: | 29.0 mcΩ |
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