Metalic Oxides

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Zinc Oxide

Zinc oxide is an inorganic compound with the formula ZnO. It usually appears as a white powder, nearly insoluble in water. The powder is widely used as an additive into numerous materials and products including plastics, ceramics, glass, cement, rubber (e.g. car tyres), lubricants, paints, ointments, adhesives, sealants, pigments, foods (source of Zn nutrient), batteries, ferrites, fire retardants, first aid tapes, etc. ZnO is present in the Earth crust as a mineral zincite; however, most ZnO used commercially is produced synthetically.

Particulars ZnO – Grade A ZnO – Grade B ZnO – Grade C
Content of Zinc Oxide (ZnO) 99.5% min 99.0% min 98.0% min
Content of heavy metal as Lead (Pb) 0.10% max 0.10% max 0.15% max
Content of Iron (Fe) 0.007% max 0.02% max 0.015% max
Solubility in HCl 0.02% max 0.02% max 0.05% max
Loss on Ingnition 0.05% max 0.10% max 0.15% max
Moisture 0.05% max 0.15% max 2.00% max
Residue of sieve 325 mesh 0.05% max 0.15% max 2.00% max
Nitrogen Surface Area 4-6 m2/g 4-6 m2/g 4-6 m2/g

Litharge / Lead Mono-Oxide

Description Test Specification
Appearance Yellow Fine Powder
Purity 99.5% min
Free Lead Rigid PVC: Pipes and technical profiles
Particle (for granular)
+8 mesh
-18 mesh		 Nil
5.0% max
Particle (for powder) + 325 mesh 0.2% max

Litharge, which is Lead Mono-Oxide (PbO) is a yellowish or reddish, odorless, heavy, earthy, water-insoluble, solid, PbO, used chiefly in the manufacture of Lead Stabilizers (Lead Steareates), pottery, Lead glass, paints, enamels, and inks. Litharge is also called Lead Monoxide, Lead Oxide, Plumbous Oxide.

Other use of Litharge is as intermediate used in a variety of industries like lubricants and greases, insecticides, inorganic pigments, Lead soaps, petroleum refining, rubber and PVC etc.

Red Lead

Red Lead is used or utilized in battery manufacture ( for BatteryPlates), manufacturing of Crystal Glass, Ceramics and Anti-Corrosivecoatings.

It is used for protection of ferrous metal surfaces as a Primer, as apolymer stabilizer and vulcanizer in rubber industries, making OpticalGlass and Antirust Paint. it is also used as a weak oxidizer inchemical industry.

Description Test Specification
Free Lead nil
Oxidation Level 68 – 70%
Moisture Content 0.5% max
Antimony (Sb)
0.001% max
Iron (Fe) 0.001% max
Barium (Ba) 0.005% max
Amorphous In the form of powder
Colour Orange
Apparent Density 1.30 – 1.60 gm/cc
Acid Absorption 175 – 210 mg of acid/gm of Red Lead

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