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Pharmaceutical excipients
Zinc sulfate heptahydrate

Product name

Zinc sulfate, heptahydrate

Specification

Pharmaceutical grade (USP,BP,EP,CP)

Molecular formula

ZnSO4·7H2O

CAS

7446-20-0

H.S. CODE

2833293000

Molecular weight

278.05

Appearance

Colorless crystal powder

Package

25KG Woven bags or fiber drums



Property

    Odorless crystaline powder or granules. zinc sulfate is a colorless crystalline solid. Zinc sulfate is also obtained as a hexahydrate, ZnSO4.6H2O, and as a heptahydrate ZnSO4.7H2O. All forms are soluble in water. All are noncombustible.  It is used in the production of rayon, as a feed supplement, and as a fertilizer ingredient.

Application

    Used in the manufacture of lithopone, and used as mordant, astringent, wood preservative, etc.

Test standard

Test items

Specification

BP2015

USP35

CP2015

Appearance

Colorless crystal powder

Colorless crystal powder

Colorless crystal powder

Assay

99.0~104.0%

99.0~108.7%

99.0~103.0%

Appearance of solution

Conform

 

Conform

Acidity

 

Conform

Conform

Arsenic

 

0.0014%

 

pH

4.4~5.6

 

 

Chloride

0.03%

 

Conform

Lead

 

0.002%

0.001%

Iron

0.01%

0.0003%

 

Alkaline and alkaline earth metals

 

0.9%

0.5%

Storage

   Store in a tightly closed container. Store in a cool, dry, well-ventilated area away from incompatible substances.


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