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.
Sulfuric acid 30%
Phosphoric acid 55%
room temperature ~ 80 ℃
Time 2 ~ 10min
Current Density: 10~15A/ dm2