Hakko  FS-100 Chemical Paste is specially formulated to easily remove oxide from soldering tips. 

Features:

• Paste re-tins oxidized soldering iron tips and is 100% Lead-Free.

• Depending on the severity of the oxidation and/or corrosion, paste will help rejuvenate very oxidized and/or corroded soldering iron tips back to useful life.

• Can be used alone or use with the FT-700 Tip Polisher for increased effectiveness.

• Flux does not contain Diammonium phosphate and does not leave a corrosive residue.

Specifications:

• Specs: Conforms to JIS-Z-3197 6.6.1 test method.

NOTE:  For optimum performance, use the FS-100 paste in conjunction with the Hakko FT-700 tip polisher for increased oxide removal.