Silver-flo™ Flux Paste is a brazing flux suitable for use with silver brazing filler metals. It has a working range of 575-775ºC and can be used with silver brazing filler metals melting below 725°C (such as several of the Silverflo™, Easy-flo™ and Argo-braze™ alloys). It is suitable for use on all the common engineering materials, (copper, brass, mild steel and stainless steel), but not aluminum. JM special purpose fluxes are required when brazing aluminum bronze, certain grades of stainless steel, tungsten, molybdenum and tungsten carbide or where protracted heating is involved. This product is also referred to as Easy-flo™ Low Temperature Grade Paste. In order to ensure a consistent mixture throughout stir the flux paste well before use. Flux paste should be brushed onto the joint surfaces before assembly. Further flux should then be applied externally either side of the joint mouth. It is good practice to mechanically clean and degrease the joint surface before applying flux. Heat slowly and evenly to the brazing temperature, without local overheating. Use the flux as a temperature guide - it will become clear or opaque as brazing temperature is approached. If blackening of the flux occurs this is often a sign of insufficient flux, overheating or flux exhaustion. Information provided by Johnson Matthey Metal Joining |