Qualitek sac305 solder wire with nc600e flux qualitek nc600 305 020w a flux cored solder wire made from sac305 965 30 a lead free alloy consisting of 965 tin 3 silver and 05 copper the nc600e flux is made from synthetically refined resin combined with a highly effective activator qualitek lead free solder wire sac305 nc600 flux 22 051mm 500g reel