Testing Item | Standard | Result |
Characters | White crystalline powder | White crystalline powder |
Content (on dry basis) (%) | ≥99.5 | 99.71 |
Sulphate (SO4) (%) | ≤0.04 | <0.04 |
Heavy metals (pb) (%) | ≤0.001 | <0.001 |
Arsenic (As) (%) | ≤0.0002 | <0.0002 |
Oxidable matter (%) | passed | passed |
Loss on drying (%) | ≤0.5 | 0.38 |
Residue on ignition (%) | ≤0.1 | 0.06 |
Melting point (ºC) | 200~206 | 205 |
Note: Special requirements of particle size should be negotiated by both suppliers and customers |