Soda Feldspar (Bath Potters / CTM)
A standard material in Glazecalc's library: its oxide analysis, unity contribution and hazards.
What it is
- Kind
- Feldspars and stones
- Formula
- K₂O 2.8%, Na₂O 8.5%, Al₂O₃ 18.5%, SiO₂ 69.5%
- Also called
- Feldspar, Soda, CTM 50, Bath Potters Soda Feldspar
- Sold in
- UK
- Source
- Bath Potters' Supplies 'Soda Feldspar' product page (2026-05)
The soda feldspar figures printed by Bath Potters and CTM; Bath Potters says it is Norwegian.
Oxide analysis and unity formula
Glazecalc has the analysis of Soda Feldspar (Bath Potters / CTM) as weight percent of the raw material. The unity contribution is the moles of each oxide in the amount of Soda Feldspar (Bath Potters / CTM) that holds 1.0 mole of flux, which is how Glazecalc adds it into a recipe's unity formula.
| Oxide | Weight % | Unity contribution |
|---|---|---|
| K₂O | 2.8 | 0.178 |
| Na₂O | 8.5 | 0.822 |
| Al₂O₃ | 18.5 | 1.087 |
| SiO₂ | 69.5 | 6.932 |
- Equivalent weight
- 599.27
- Fired weight
- 599.27
- Loss on ignition
- 0%
The equivalent weight is the grams of Soda Feldspar (Bath Potters / CTM) 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 Soda Feldspar (Bath Potters / CTM) to a recipe in the Glazecalc calculator to see what it does to a glaze's unity formula.