Russia National Standard GOST 11683-76
Sodium Metabisulfite for Industrial Use
Specifications:
| Items | Specifications | |
| Grade 1 | Grade 2 | |
| Appearance | white or yellowish crystalline powder | white or yellowish crystalline powder |
| Main content (Na2S2O5) %,≥ | 95.0 | 92.5 |
| Iron (Fe)%，≤ | 0.005 | 0.015 |
| Water Insoluble %，≤ | 0.05 | 0.10 |
| Arsenic (As)%, ≤ | 0.001 | 0.001 |
Remarks: Sodium metabisulfite used in pharmaceutical and food industries, shall have heavy metal (Pb) mass fraction not exceeding 0.002% and chloride (Cl) mass fraction not exceeding 0.2%.
