Hymod AT Ball Clay
A standard material in Glazecalc's library: its oxide analysis, unity contribution and hazards.
What it is
- Kind
- Clays
- Formula
- SiO₂ 54%, TiO₂ 1.2%, Al₂O₃ 29%, Fe₂O₃ 2.3%, CaO 0.3%, MgO 0.4%, K₂O 3.1%, Na₂O 0.5%, LOI 8.7%
- Also called
- AT ball clay, Hymod AT, AT Hymod, Potclays 3409, Potterycrafts P3352, Valentine CB005, Bath Potters AT Hymod Ball Clay
- Made by
- Sibelco (Dorset, UK)
- Sold in
- UK
- Source
- Valentine Clays technical data sheet 'Hymod AT Ball Clay' (mean values) (2025-03)
Dorset ball clay with high strength and fairly high iron (about 2.3% Fe2O3), used in warm-coloured stoneware bodies and in some UK glazes and slips.
Oxide analysis and unity formula
Glazecalc has the analysis of Hymod AT Ball Clay as weight percent of the raw material. The unity contribution is the moles of each oxide in the amount of Hymod AT Ball Clay that holds 1.0 mole of flux, which is how Glazecalc adds it into a recipe's unity formula.
| Oxide | Weight % | Unity contribution |
|---|---|---|
| SiO₂ | 54 | 15.977 |
| TiO₂ | 1.2 | 0.267 |
| Al₂O₃ | 29 | 5.056 |
| Fe₂O₃ | 2.3 | 0.256 |
| CaO | 0.3 | 0.095 |
| MgO | 0.4 | 0.176 |
| K₂O | 3.1 | 0.585 |
| Na₂O | 0.5 | 0.143 |
- Equivalent weight
- 1777.71
- Fired weight
- 1623.05
- Loss on ignition
- 8.7%
The equivalent weight is the grams of Hymod AT Ball Clay that hold 1.0 mole of flux. The fired weight is what is left of that after firing.
Hazards and safety
Hazards: Fine dust contains respirable crystalline silica; avoid breathing it.
Use it in a recipe
Add Hymod AT Ball Clay to a recipe in the Glazecalc calculator to see what it does to a glaze's unity formula.