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Oxides

Zirconium Silicate

Zirconium Silicate

£6.00
Stock Status: In Stock
1Kg and 5Kg Packs
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 ZrSiO4. Zirconium silicate is extremely stable and will survive to very high temperatures in a glaze melt without dissolving (although small amounts do dissolve). 4-7% produces semi opaque, 8-10% usually produces full opacity but some transparent glazes require even higher amounts; amounts beyond 20% reach saturation where crystallization begins to occur. The exact amount needed varies between different glaze types. It is thus most effective at low temperatures. Tin oxide can be a more effective opacifier than zircon (it has various advantages and disadvantages).
High amounts of zircon opacifier can cause cutlery marking (because of abrading angular micro-particles projecting from the glaze surface).
Zircon has a low expansion, so it will tend to reduce crazing. In addition, it will increase melt viscosity, which means that crawling and pinholing can occur in glazes having a lot of zircon. These problems can normally be solved by cooling slower and taking measures to get a better bond between raw glaze and body during application.
Because of its high thermal stability zircon is also employed in making various hi-tech porcelain bodies and materials. It is a major source for the production of zirconium oxide ZrO2.