ITEM NAME:New 50g Rosin Soldering Flux Paste Solder High Intensity Welding Grease 3c Features: 100% brand new and high quality. Rosin flux is used to facilitate soldering. It cleans and prevents metal oxidation which allows solder to create strong, long lasting mechanical and electrical bonds. It also acts as a wetting agent, increasing the flow of solder and the efficiency of the soldering process. Cleans and prevents oxidation Increases flow of molten solder Neutral PH 7 Â ±0.3 Specifications: Material:Rosin Box Size: approx. 75*75*20mm Net weight: 38g Package Included:.Rosin flux is used to facilitate soldering. 1 x 37g Rosin Soldering Flux Paste. It also acts as a wetting agent, increasing the flow of solder and the efficiency of the soldering process. Increases flow of molten solder.