Multicore loctite 60 40 low fuming no clean 60en leaded solder wire multicore 289155 p multicore loctite mc050 is a low fuming no clean 60 40 tin lead solder with x39 flux cores p p it has been specially formulated to have a very low flux contact and is designed for use in no clean wave and reflow soldering environments given the very low residues when soldering it may also be used for repair work following any cleaning processes meeting the requirements of bellcore and ipc class 3