Hakko’s FS-100 Tip Polish is specially formulated to easily remove oxide from soldering tips. Can be used alone or use with the FT-700 Tip Polisher for increased effectiveness. TIP POLISHING PASTE The Hakko FS-100 paste re-tins oxidized soldering iron tips and is 100% Lead-Free. The flux does not contain Diammonium phosphate and does not leave a corrosive residue. (Conforms to JIS-Z-3197 6.6.1 test method.) Depending on the severity of the oxidation and/or corrosion, the FS-100 will help rejuvenate very oxidized and/or corroded soldering iron tips back to useful life. For optimum performance, use the FS-100 paste in conjuntion with the Hakko FT-700 tip polisher for increased oxide removal.