A specially low running temperature cadmium free silver solder. Melts as soon as steel shows first dark cherry red in daylight. Due to this low running temperature you can silver solder spring steel without causing brittleness. This flexible stainless steel tubing can withstand working temperatures up to 600ºC, using our silver solder this can be soldered at almost the working temperature. This silver solder is ideal for soldering thin wall steel tubing and thin sheet steel such as is used in making header pipes and silencers. As apposed to the flux coated rods you apply the paste flux directly onto the bare joint to be soldered, avoiding a build up of oxidized surface metal. The workpiece needs only to be laid onto a firebrick, heated up with a Propane gas burner until the flux melts giving a clear liquid, this then is the temperature at which the silver solder will run. Allow the join to cool slowly. Remove the flux residue with hot water and a brass or stainless steel wire brush.