
| Oxalic Acid Content | 99.6%Min | 99.4%Min | 99.0%Min |
| Sulphate | 0.08%Max | 0.10%Max | 0.20%Max |
| Heavy Metals(Pb2+) | 0.001%Max | 0.002%Max | 0.02%Max |
| Ferrous(Fe3+) | 0.0015%Max | 0.002%Max | 0.01%Max |
| Chloride(Cl-) | 0.003%Max | 0.004%Max | 0.01%Max |
| Ignition Residue(850℃) | 0.08%Max | 0.10%Max | 0.20%Max |