Kona F-4 Feldspar
A standard material in Glazecalc's library: its oxide analysis, unity contribution and hazards.
What it is
- Kind
- Feldspars and stones
- Status
- Discontinued 2009
- Formula
- SiO₂ 66.7%, Al₂O₃ 19.6%, CaO 1.7%, K₂O 4.8%, Na₂O 6.9%, LOI 0.5%
- Also called
- F-4, F-4 Feldspar, Kona F4, F4 Feldspar, Kona F-4 Soda Feldspar
- Sold in
- US
- Similar materials
- Minspar 200 , FFF Feldspar (Sibelco FFF K7-60) , Soda Feldspar (Walker BA340, India)
- Source
- Digitalfire: Kona F-4 Feldspar
A popular North American soda feldspar that is no longer made; Minspar 200 has very similar chemistry and is the usual replacement.
Oxide analysis and unity formula
Glazecalc has the analysis of Kona F-4 Feldspar as weight percent of the raw material. The unity contribution is the moles of each oxide in the amount of Kona F-4 Feldspar that holds 1.0 mole of flux, which is how Glazecalc adds it into a recipe's unity formula.
| Oxide | Weight % | Unity contribution |
|---|---|---|
| SiO₂ | 66.7 | 5.764 |
| Al₂O₃ | 19.6 | 0.998 |
| CaO | 1.7 | 0.157 |
| K₂O | 4.8 | 0.265 |
| Na₂O | 6.9 | 0.578 |
- Equivalent weight
- 519.21
- Fired weight
- 516.61
- Loss on ignition
- 0.5%
The equivalent weight is the grams of Kona F-4 Feldspar that hold 1.0 mole of flux. The fired weight is what is left of that after firing.
Hazards and safety
Hazards: Contains crystalline silica; avoid breathing the dust.
Use it in a recipe
Add Kona F-4 Feldspar to a recipe in the Glazecalc calculator to see what it does to a glaze's unity formula.