Qualitek sac305 solder wire with nc601e rosin no clean flux qualitek nc601e 305 028w a flux cored solder wire made from sac305 965 30 a lead free alloy consisting of 965 tin 3 silver and 05 copper the nc601e flux is a colophony free no clean type that leaves virtually no post soldering residue for a visibly clean solder connection qualitek solder wire sac305 nc601 rosin free no clean flux 22 071mm 500g reel