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| Index name | Index | ||||
| | high-grade | first-grade | |||
| MgSO4·7H2O %≥ | 99.5 | 99 | |||
| Cl %≤ | 0.001 | 0.014 | |||
| Pb %≤ | 0.001 | 0.001 | |||
| As) %≤ | 0.0002 | 0.0002 | |||
| Fe %≤ | 0.0015 | 0.002 | |||
| about thin degree it can pass experiment screen of W=400um. ≥ | 95 | 95 | |||
| Storage: sealing, preservation in drying place. Guaranteed quality expiration is three or four years.
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MgSO4.7H2O
