Zinc Oxide USP
Zinc oxide is an inorganic compound with the formula ZnO. ZnO is a white powder that is insoluble in water, and it is widely used as an additive in numerous materials and products. It occurs naturally as the mineral zincite, but most zinc oxide is produced synthetically.
Most applications exploit the reactivity of the oxide as a precursor to other zinc compounds. Zinc oxide as a mixture with about 0.5% iron (III) oxide (Fe2O3) is called calamine and is used in calamine lotion. Zinc oxide is widely used to treat a variety of other skin conditions, in products such as baby powder and barrier creams to treat diaper rashes, calamine cream, anti-dandruff shampoos, and antiseptic ointments. Zinc oxide is added to many food products, including breakfast cereals, as a source of zinc, a necessary nutrient.
Chemical Name: Zinc Oxide
Mol. Formula: ZnO
Mol. Weight: 81.38 g/mol
CAS No: 1314-13-2
|Characters||It occurs as very fine, odorless, amorphous, white or yellowish white powder, free from gritty particles|
(a)When strongly heated, it assumes a yellow color that disappears on cooling.
(b) It gives positive responds to the test for zinc
|Solubility||Soluble in dilute acids; insoluble in water and in alcohol|
|Loss on Ignition||Not more than 1.0%|
|Carbonate and color of solution||Specified test. No effervescence occurs and the solution is clear and colorless|
|Arsenic||Not more than 6 ppm|
|Lead||Specified test. No turbidity or precipitate is produced|
|Iron and Other Heavy Metals||Specified test. White precipitates are formed in both aliquots.|
|Residual solvents||Meets the requirements|
|Assay||Not less than 98.0% and not more than 102.0% on ignited basis|
Shelf life, Storage and Packing
It should be stored in a segregated area in a cool and ventilated place away from combustible materials. Keep in a tightly closed container, sealed until ready for use. It is packed in 25kg or 50kg HDPE bags or drums as required.
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