Zinc Oxide (White Seal)

Zinc Oxide (White Seal) is a white fine fluffy powder with a wide ranging particle size from 5 microns to 0.1 microns depending upon the process of manufacture. It turns yellow on high temperatures but regains its colour on cooling. It does not melt but sublimes at ordinary pressure of 1975o + 25 o C. It exhibits thermoluminescence and photoconductivity. Its solubility in water is 0.005 gm/litre at 25 o C. A slurry of the commercial product has a PH of 7.5 to 7.9. The Oxide is more soluble in acqueous ammonia (0.28gm/lit in 1% ammonia at 25 o C ). It is a stable compound and can be stored for a considerable period of time.

PCIL manufactures various grades of Zinc Oxide for different industries, the main industries which use Zinc Oxide are as under :-

1. Rubber and Tyre Industry
2. Ceramics and Glass Industry
3. Paints / Chrome Industry
4. Ferrite Industry
5. Pharmaceutical Industry
6. Frit Industry
7. Catalyst Industry

Some typical specifications are given below although the company can manufacture Zinc Oxide as per the clienta s individual specification.