GMP Manufactuer of ZINC OXIDE PHARMACEUTICAL GRADE USP34 from China-Sincere Union Imp&Exp Co.,Ltd
CAS NO. : 1314-13-2
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(spe
cial packing can be made according to clients' requirement).
Specification: Zinc Oxide Pharmaceutical Grade USP34( %
|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|
|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.