CР-6, a high-temperature copper-phosphoric solder

CР-6, a high-temperature copper-phosphoric solder Different copper-phosphoric solders are widely used for high-temperature soldering of copper and its alloys because they have deep flow and low melting temperature. Let us consider one of such copper-phosphoric solders taking CP-6 solder produced as German brand Chemet as an example. CP-6 solder is alternative of silver-containing copper-phosphoric solders. Operating temperature is just 20 °C higher. Number 6 in a solder indicates percentage of phosphorus. CP-6 is used not only in industry but also for brass brazing of copper and especially for soldering of copper pipes. Operating solder temperature is 760 °C, therefore different gas burners with the minimum flame temperature of 1300°C are used for soldering. Under 890 °C a solder yields and under 710 °C it becomes solid. It's remarkable that we don't need a fluxing agent when soldering copper with copper but we should take a special fluxing paste Chemet Flisil-NS-Paste or auger fluxing agent or boracic acid when soldering copper with brass or bronze. It should be noticed that a solder got a high-quality mark of German community for checking quality of copper pipes. In terms of hygiene CP-6 solder is not destructive to health. A solder doesn't contain such unhealthful materials as lead, cadmium or stibium. Thus, we make sound and moreover harmless connections of high quality when using CР-6 for brass brazing.