Functions and Uses：
1. DU-691 can combine 2 processes, alkaline degreasing and acid pickling, in 1 operation.
2. It can completely remove the oil and black dirt created from smelting and welding to reduce the rate of defectiveness。
3. Upon its excellent degreasing performance, DU-691 only takes a shorter processing time compared to the simply acid (hydrochloric or sulfuric acid) pickling treatment.
Operating Components：
DU-691 30~80mL/L1. DU-691 can combine 2 processes, alkaline degreasing and acid pickling, in 1 operation.
2. It can completely remove the oil and black dirt created from smelting and welding to reduce the rate of defectiveness。
3. Upon its excellent degreasing performance, DU-691 only takes a shorter processing time compared to the simply acid (hydrochloric or sulfuric acid) pickling treatment.
Operating Components：
Hydrochloric acid 170~350mL/L
Temperature Room temperature
Time 15~30min
