Molecular Formula: ZnSO4.7H2O
Molecular Weight: 287.54
Properties: colorless rhombic system prismatic crystal, relative density: 1.957, M.P. 100℃,easily soluble in water(96.5g/100ml water at 20℃; 663.6g/100ml at 100℃), slightly soluble in alcohols and glycerol, will efflorescent in dry air; will loose all crystal water at 280℃; will be decomposed at 500℃ above; it is white or yellowish crystal, soluble in water, slightly soluble in alcohols and glycerol.
Quality Spec.:
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Technical grade(HG/T2326-92)
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Feed grade(HG/2934-2000)
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Assay(ZnSO4.7H2O )≥98.0%
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Assay(ZnSO4.H2O)≥97.3%
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Zn ≥22.51%
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Zn ≥22%
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pH-value(50g/l solution)≥3.0
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As ≥0.0005%
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Chlorides ≤0.2%
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Pb ≤0.0001%
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Pb ≤0.002%
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Cd ≤0.002%
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Mn ≤0.001%
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Fineness(through 250um sieve)≥95%
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Cd ≤0.002%
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Fe ≤0.005%
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Cu ≤0.002%
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Insol. in water ≤0.02%
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Use: As raw material for light-type astringent and latex products; in the making of calamine; as skin protective agent; also used in the production of rayon, petroleum and catalysts; it is also widely used in rubber, paints and pharmaceutical industries.
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