Qualitek sn100e solder wire with nc600e flux qualitek nc600 sn100 020 a flux cored solder wire made from sn100e a lead free alloy consisting of 995 tin 05 copper and a trace of cobalt the nc600e flux is made from synthetically refined resin combined with a highly effective activator qualitek lead free solder wire sn100e nc600 flux 22 051mm 500g reel