Kaolin 233 (Carl Jäger)
A standard material in Glazecalc's library: its oxide analysis, unity contribution and hazards.
What it is
- Kind
- Clays
- Formula
- SiO₂ 50.4%, Al₂O₃ 34.3%, Fe₂O₃ 0.5%, TiO₂ 0.4%, K₂O 1.9%, Na₂O 0.2%, LOI 11.5%
- Also called
- Kaolin 233/, Kaolin 233, Carl Jäger Kaolin 233, Kaolin Carl Jäger, Kaolin (Silica Nordic 30014)
- Made by
- Not named; sold by Carl Jäger Tonindustriebedarf GmbH (Hilgert, Westerwald, Germany)
- Sold in
- EU
- Similar materials
- German Kaolin (Bodmer Ton 539) , Zettlitz Kaolin (Sedlec Ia) , Grolleg China Clay
- Source
- Carl Jäger Tonindustriebedarf, 'Technisches Datenblatt Kaolin 233' (4 February 2013) (2013-02)
The standard 'Kaolin' of Carl Jäger, a large German pottery supplier in the Westerwald. Carl Jäger describes it as very white-firing, for glazes and bodies, raising scratch hardness, chemical resistance and glaze viscosity. Glazy entries show it is also sold in Belgium (Argilières Hins), and Silica Nordic in Denmark sells a kaolin with the same figures.
Oxide analysis and unity formula
Glazecalc has the analysis of Kaolin 233 (Carl Jäger) as weight percent of the raw material. The unity contribution is the moles of each oxide in the amount of Kaolin 233 (Carl Jäger) that holds 1.0 mole of flux, which is how Glazecalc adds it into a recipe's unity formula.
| Oxide | Weight % | Unity contribution |
|---|---|---|
| SiO₂ | 50.4 | 35.851 |
| Al₂O₃ | 34.3 | 14.378 |
| Fe₂O₃ | 0.5 | 0.134 |
| TiO₂ | 0.4 | 0.214 |
| K₂O | 1.9 | 0.862 |
| Na₂O | 0.2 | 0.138 |
- Equivalent weight
- 4273.9
- Fired weight
- 3782.4
- Loss on ignition
- 11.5%
The equivalent weight is the grams of Kaolin 233 (Carl Jäger) that hold 1.0 mole of flux. The fired weight is what is left of that after firing.
Hazards and safety
Hazards: Carl Jäger's safety data sheet (version 5, 30.01.2018) classifies it as not hazardous but notes it contains less than 1% fine crystalline silica; avoid making dust.
Use it in a recipe
Add Kaolin 233 (Carl Jäger) to a recipe in the Glazecalc calculator to see what it does to a glaze's unity formula.