Zirconium Spinel
Alternate Names: Synthetic zirconium silicate, zinc aluminate spinel
Description: Synthetic zinc–alumina–zirconia–silica opacifier
Formula: ZnO·Al₂O₃·ZrO₂·SiO₂
| Oxide | Analysis | Formula | Tolerance |
|---|---|---|---|
| ZnO | 22.20% | 1.00 | |
| ZrO2 | 33.60% | 1.00 | |
| Al2O3 | 27.82% | 1.00 | |
| SiO2 | 16.39% | 1.00 | |
| Oxide Weight | 366.70 | ||
| Formula Weight | 366.70 | ||
Notes
Zirconium spinel is an older commercial name for a synthetic ceramic material containing zinc, alumina, zirconia and silica, used as a glaze opacifier and color stabilizer. The EPA recognizes the name under “Spinels, aluminum zinc zirconium.”
This zirconium silicate variation had colour-stabilizing abilities (likely with certain colors that benefitted from the presense of zinc, e.g. iron chrome browns). It was often combined with other zirconium opacifiers.
Related Information
Links
| Typecodes |
Opacifier
Opacifiers are powders that turn transparent glazes opaque by various chemical and physical mechanisms (and combinations of mechanisms). |
| Materials |
Zircon
Zircon (zirconium silicate) is a hard, dense, refractory ceramic material used to opacify pottery glazes and in refractory products such as kiln washes, crucibl |
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