Potash Feldspar (Valentine Clays)
A standard material in Glazecalc's library: its oxide analysis, unity contribution and hazards.
What it is
- Kind
- Feldspars and stones
- Formula
- SiO₂ 69.5%, Al₂O₃ 16.6%, CaO 0.39%, K₂O 10.4%, Na₂O 2.3%, Fe₂O₃ 0.12%, TiO₂ 0.03%
- Also called
- Valentine FL005
- Sold in
- UK
- Similar materials
- G-200 EU Feldspar , Mahavir Potash Feldspar
- Source
- Valentine Clays technical data sheet 'Potash Feldspar' (mean values) (2024-07)
Valentine Clays' potash feldspar, a typical potash spar with about 10.4% K2O and 2.3% Na2O.
Oxide analysis and unity formula
Glazecalc has the analysis of Potash Feldspar (Valentine Clays) as weight percent of the raw material. The unity contribution is the moles of each oxide in the amount of Potash Feldspar (Valentine Clays) that holds 1.0 mole of flux, which is how Glazecalc adds it into a recipe's unity formula.
| Oxide | Weight % | Unity contribution |
|---|---|---|
| SiO₂ | 69.5 | 7.488 |
| Al₂O₃ | 16.6 | 1.054 |
| CaO | 0.39 | 0.045 |
| K₂O | 10.4 | 0.715 |
| Na₂O | 2.3 | 0.240 |
| Fe₂O₃ | 0.12 | 0.005 |
| TiO₂ | 0.03 | 0.002 |
- Equivalent weight
- 647.36
- Fired weight
- 647.36
- Loss on ignition
- 0%
The equivalent weight is the grams of Potash Feldspar (Valentine Clays) 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 Potash Feldspar (Valentine Clays) to a recipe in the Glazecalc calculator to see what it does to a glaze's unity formula.