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Uses:Leather, chrome tanning method of camouflage acid; Stability for the catalyst and synthesis of agents; Printing and dyeing industry, reducing agent. For the production of sodium hydrosulfite, oxalic acid and formic acid
| Items | Index |
| ||
| Content ,% ≥ | 90 | 92 | 95 | 97 |
| Sodium hydroxide ,% ≤ | 1.5 | 1.5 | 1.0 | 0.5 |
| Sodium carbonate ,% ≤ | 3.0 | 2.5 | 1.5 | 0.5 |
| Sodium chloride ,% ≤ | 3.0 | 2.5 | 2.5 | 0.5 |
| Sulfured sodium ,% ≤ | 0.02 | 0.02 | 0.02 | 0.01 |
| Water ,% ≤ | 1.5 | 1.5 | 1.0 | 0.8 |
