We are thriving committed to offering a diverse assortment of sn99. 3cu0. 7 lead, Free solder wires. Other details sn99. 3cu0. 7 is a core solder tailored for low residue applications aimed at no, Clean welding applications and should adhere to all applicable Bellcore guidelines specifications. A unique mixture composed of rosin along with unique activating agents wets quickly while leaving completely inert, A minimal, Optically transparent residue. High performance, Fast wetting cored wire to the highest reliability standards. Suitable for all manual and automatic welding, Component connection and rework operationsminimal, Non, Corrosive flux residue for high welding efficiencyuniform core flux distributiongood weldability, Strong joint