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: Zinc Oxide Pharmaceutical Grade 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
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 5 ml of glacial acetic acid, and warm on a steam bath until solution is effected,the addition of 5 drops of potassium chromate TS produces no turbidity or precipitate
Iron and other heavy metals
Cooled 5ml portions of the solution obtained in the test for carbonate and color of solution yield white precipitates with potassium ferrocyanide TS and with sodium sulfide TS
Assay
��Dissolve about 1.5 g of freshly ignited Zinc Oxide, accurately weighed, and 2.5 g of ammonium chloride in 50.0 mL of 1 N sulfuric acid VS with the aid of gentle heat, if necessary.
When solution is complete, add methyl orange TS, and titrate the excess sulfuric acid with 1 N sodium hydroxide VS. Each mL of 1 N sulfuric acid is equivalent to 40.69 mg of ZnO.
Relevant Products
Pharmaceutical Grade Zinc Oxide EP7 Pharmaceutical Grade Zinc Oxide BP2012
Pharmaceutical Grade Zinc Oxide USP34 Pharmaceutical Grade Gold Seal
Feed Grade Zinc Oxide 72% 76% Other Pharmaceutical Raw Materials
