HVAR Ball Clay
A standard material in Glazecalc's library: its oxide analysis, unity contribution and hazards.
What it is
- Kind
- Clays
- Formula
- SiO₂ 59.6%, TiO₂ 1.4%, Al₂O₃ 27.1%, Fe₂O₃ 0.9%, CaO 0.1%, MgO 0.3%, K₂O 2.7%, Na₂O 0.4%, LOI 7.5%
- Also called
- HVAR, Ball Clay (HV), Potclays 3408, Bath Potters HVAR Ball Clay
- Sold in
- UK
- Source
- Potclays 'Ball Clay (HV)' product page, ball clay comparison chart ('Information correct Apr 17') (2017-04)
Low-plasticity, white-firing ball clay sold by Potclays, popular in stoneware bodies; whiter firing than TWVA.
Oxide analysis and unity formula
Glazecalc has the analysis of HVAR Ball Clay as weight percent of the raw material. The unity contribution is the moles of each oxide in the amount of HVAR 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 | 59.6 | 22.369 |
| TiO₂ | 1.4 | 0.395 |
| Al₂O₃ | 27.1 | 5.994 |
| Fe₂O₃ | 0.9 | 0.127 |
| CaO | 0.1 | 0.040 |
| MgO | 0.3 | 0.168 |
| K₂O | 2.7 | 0.646 |
| Na₂O | 0.4 | 0.146 |
- Equivalent weight
- 2255.07
- Fired weight
- 2085.94
- Loss on ignition
- 7.5%
The equivalent weight is the grams of HVAR 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 HVAR Ball Clay to a recipe in the Glazecalc calculator to see what it does to a glaze's unity formula.