Natronfeldspat (Bodmer 549)
A standard material in Glazecalc's library: its oxide analysis, unity contribution and hazards.
What it is
- Kind
- Feldspars and stones
- Formula
- SiO₂ 71.6%, Al₂O₃ 17%, Na₂O 9%, CaO 0.85%, K₂O 0.6%, Fe₂O₃ 0.18%, MgO 0.1%, TiO₂ 0.05%, LOI 0.6%
- Also called
- Bodmer Natronfeldspat, Bodmer 549, Feldspath sodique (Bodmer)
- Sold in
- EU
- Similar materials
- Soda Feldspar (Potclays 3427M / Potterycrafts P3317) , Natronfeldspat LF 90 / LA 75 (Sibelco Germany)
- Source
- Bodmer Ton AG technical data sheet 'Natronfeldspat', article 549 (Stand April 2025) (2025-04)
Soda feldspar (mainly albite) with a little extra quartz, sold by Bodmer Ton in Switzerland. Bodmer gives its melting point as 1180 °C.
Oxide analysis and unity formula
Glazecalc has the analysis of Natronfeldspat (Bodmer 549) as weight percent of the raw material. The unity contribution is the moles of each oxide in the amount of Natronfeldspat (Bodmer 549) that holds 1.0 mole of flux, which is how Glazecalc adds it into a recipe's unity formula.
| Oxide | Weight % | Unity contribution |
|---|---|---|
| SiO₂ | 71.6 | 7.042 |
| Al₂O₃ | 17 | 0.985 |
| Na₂O | 9 | 0.858 |
| CaO | 0.85 | 0.090 |
| K₂O | 0.6 | 0.038 |
| Fe₂O₃ | 0.18 | 0.007 |
| MgO | 0.1 | 0.015 |
| TiO₂ | 0.05 | 0.004 |
- Equivalent weight
- 590.95
- Fired weight
- 587.4
- Loss on ignition
- 0.6%
The equivalent weight is the grams of Natronfeldspat (Bodmer 549) that hold 1.0 mole of flux. The fired weight is what is left of that after firing.
Hazards and safety
Hazards: Bodmer labels it GHS08 (health hazard) because the dust contains respirable crystalline silica; avoid breathing it.
Use it in a recipe
Add Natronfeldspat (Bodmer 549) to a recipe in the Glazecalc calculator to see what it does to a glaze's unity formula.