Relife RL-426D 10g Solder Flux 1. High insulation resistance, easy to tin. 2. Good fluidity, less residue. 3.High insulation, safe and non-conductive. 4. Easy to weld, clean, no irritating odor, environmentally friendly solder resist rosin. 5. Quickly remove the oxide layer on the welding surface, easy to weld and prevent oxidation.