The soldering wires in the ks series have been developed for high requirements when soldering with lead free alloys they meet the required standards for industrial manufacturing and machine soldering as well as for repair and re soldering soldering wire ks115 contains a colophony free flux with synthetic resins wire flux ks115 conforms to din en 29454 1 type 122b due to their high activity 10 or 15 these wire fluxes are classified as rem1 according to iec 61190 1 3