3 Tix Solder Tubes For Guns, Irons, Torches, & Soldering Machines. This is a new set of 3 tubes of Tix solder. Adheres to all ordinary solderable materials and works with a gun, iron, torch or soldering machine. It is the hardest soft solder on earth. Melts at 275 degrees F (135 degrees C) and has a holding power of 4,300 PSI. Stays white...