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| ITEM | STANDARD |
| Purity,% (dry basis) | 99.0-101.0 |
| Chloride(Cl),% | =<0.02 |
| Sulphates (SO4),% | =<0.02% |
| Loss on drying,% | =< 1.0% |
| Ignition residue,% | =< 1.0% |
| Heavy metals(Pb),% | =<0.002 |