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CAS NO. : 1314-13-2
EINECS: 215-222-5
Molecular Formula : ZnO
Molecular Weight : 81.38
Properties : White powder,stable under normal temperature, good hiding power and colouring power.Insoluble in water and alcohol ,soluble in acid ,alkali and amkonium solution.
Use : Zinc Oxide Pharmaceutical Grade USP34 is mainly used for bandage,medicine,cosmetic,plaster,adhesive plaster,dental impression pastezinc ointment and etc
Storage : Store at a cool and dry place.
Packing : 25Kg woven bags lined with plastic bag(special packing can be made according to clients' requirement).
Specification USP34 ( %
|
Idex item |
Standard |
|
Assay(ZnO) |
99.0%-100.5% |
|
identification |
A:When stongly heated,it assumes a yellow color |
|
|
that disappears on cooling |
|
|
B:Asolution of it in a slight excess of 3N |
|
|
hydrochloric acid responds to the tests for |
|
|
Zinc<191> |
|
Alkalinity |
Mix 1.0g with 10ml of hot water,add 2 drops of |
|
|
phenolphthalein TS,and filter;if a red color |
|
|
is produced.not more than 0.30ml of 0.10 N |
|
|
hydrochloric acid is required to discharge it |
|
Loss on ignition |
not more than 1.0% |
|
As |
not more than 6ppm |
|
Carbonate and color of solution |
Mix 2.0g with 10ml of water,add 30ml of 2N |
|
|
sulfuric acid,and heat on a steam bath,with |
|
|
contant stirring;no effervescence occours |
|
|
and the resulting solution is clear and colorless |
|
Lead(Pb) |
Add 2g to 20ml of water,stir well,add 5ml of |
