Zinc Oxide Powder: The White Powder Behind Sunscreen, Rubber, Paint and Ceramics
Zinc oxide (ZnO) is a fine white powder that punches far above its weight in industry. It's an inorganic compound that's insoluble in water, thermally stable, and a semiconductor — a rare combination that lets it do jobs across rubber, paint, ceramics, electronics and more.
If you've used sunscreen, driven on tyres, or handled glazed ceramic, you've benefited from ZnO.
Why zinc oxide is so versatile
Several properties stack up: it's a UV absorber/scatterer, a mild antibacterial, a vulcanisation activator for rubber, a white pigment, and a flux/opacifier in ceramic glazes. Few single compounds bridge cosmetics, polymers and electronics the way ZnO does.
Main industrial and utility uses
- Rubber: the most important single use — ZnO activates sulphur vulcanisation, making tyres and rubber goods stronger and more durable.
- Paints and coatings: white pigment, mildew resistance and UV protection.
- Ceramics and glass: a flux and opacifier in glazes, improving strength and finish.
- Electronics: used in varistors and as a semiconductor material.
- Other: a component in many industrial and utility formulations.
Handling and storage
- Avoid breathing the fine dust — wear a mask when handling powder, and work with ventilation.
- Wear gloves and eye protection for prolonged handling.
- Keep it dry and sealed; it cakes if it absorbs moisture.
- Confirm the grade suits your application — industrial/utility grade is intended for technical use, not pharmaceutical or food applications.
Frequently Asked Questions
What is zinc oxide powder used for?
Most heavily in rubber (it activates vulcanisation), plus paints and coatings (white pigment, UV and mildew resistance), ceramic glazes, electronics (varistors/semiconductors) and many industrial formulations.
Why is zinc oxide important in rubber?
It activates the sulphur vulcanisation process, which cross-links rubber to make it stronger, more elastic and more durable — essential for tyres and rubber goods.
Is zinc oxide safe to handle?
Handle it as a technical powder: avoid breathing the dust (use a mask and ventilation), wear gloves and eye protection, and keep it dry and sealed. Industrial grade is for technical use, not food/pharma.
How should zinc oxide powder be stored?
Sealed and dry, away from moisture, which makes it cake. A tightly closed container in a dry area keeps it free-flowing.
Azlok Zinc Oxide Powder (100 g) is an industrial and utility grade ZnO for rubber, paint, ceramics and technical applications. Handle with a mask and gloves, and keep it dry.