Functions and Uses：
1. St-89 contains the interfacial agents that with strong acid-resistant so it has excellent stability in the strong acid solvent.
2. With the outstanding degreasing performance, ST-89 can remove the rusts and then fast polishing with a superior infirmity.
3. Because of the excellent oil dispersion, ST-89 can avoid the re-pollution of oil to make water washing easily.

Operating Components：
ST-89                               2%
Sulfuric acid                   30%
Phosphoric acid            55%
Temperature:
room temperature ~     80 ℃
Time                                2 ~ 10min
Current Density:           10~15A/ dm2