REFRIGERATION AND AIR CONDITIONING
REFRIGERATION AND AIR CONDITIONING
The refrigeration and air conditioning industry, due to the particular working conditions of the brazed joints, requires the use of alloys characterised by good strength parameters as well as high resistance to the effects of acids and alkalis. Thus LUT-SPAW recommends the use three component alloys copper – phosphorus – silver and silver – copper – zinc.
Alloys for the refrigeration and air conditioning industry.
Product | Composition% | Melting temp. range | Standard PN-EN ISO 17672 (PN-EN 1044) | Alloy characteristic |
|||
| Ag | Cu | P | Inne | °C | |||
 CuPSn | - | 89.5 | 6.2 | Sn 4.2 | 650-700 | - | Characterised by low melting temperature, good liquidity and capillarity. |
| CuP7Sn7 | - | 86.2 | 6.8 | Sn 7 | 650-700 | CuP 386 (CP 302) | Characterised by low melting temperature, very good liquidity and capillarity. |
| Plus | - | 86 | 6.5 | Sn 6.5 Si 0,2 | 635-675 | CuP 385 | Ideal alloy for copper-copper and copper-brass bonds. Ensures excellent illiquidity and capillarity and boasts the lowest melting temperature among all copper-phosphorus alloys. |
| Plus FC | - | 86 | 6.5 | Sn 6.5 Si 0,2 | 635-675 | CuP 385 | Covered form of INSTALFIT Plus alloy. Ideal solution for brazing copper with brass as there is no need to use flux. |
| Ag2P | 2 | 91.8 | 6.2 | - | 645-825 | CuP 279 (CP 105) | Popular alloy for copper-copper and copper-brass bonds. Ensures a good fill of the gap at low temperatures and high liquidity at high temperatures. |
| Ag5P | 5 | 88.8 | 88.8 | - | 645-815 | CuP 281 (CP 104) | Alloy recommended for bonding elements subject to vibrations. Is a guarantee for high strength bonds. |
| Ag6P | 6 | 87.9 | 6.1 | - | 643-787 | - | Due to the similarities in properties with INSTALFIT Ag15P alloy, this is an excellent cheaper alternative. Ensures low working temperature, god plasticity and strength. |
| Ag6P | 15 | 80 | 5 | - | 645-800 | CuP 284 (CP 102) | Due to its good plasticity and strength, ideal for bonding copper-copper, copper-brass joints which will be subject to vibrations. |
| Ag25Sn | 25 | 40 | - | Zn33 Sn 2 | 680-760 | Ag 125 (AG 108) | Good liquidity and sufficient capillary effect, moderate mechanical properties, good plasticity. |
| Ag33 | 33 | 34 | - | Zn 33 Si 0.15 | 700-740 | - | Efficient universal use alloy. Ensures good liquidity and very good mechanical properties. |
| Ag44 | 44 | 30 | - | Zn 26 | 675-735 | Ag 244 (AG 203) | Due to its very good brazing properties this alloy is extensively used in the installation, tool and machinery refrigeration and solar panel industries. |
| Ag45Sn | 45 | 27 | - | Zn 25.5 Sn 2.5 | 640-680 | Ag 145 (AG 104) | Ideal alloy for general use, especially where low temperatures are required, e.g. during brazing of stainless steel. Ensures a very good liquidity, capillarity and mechanical properties. Ideal alternative to alloys with cadmium. |
