Standard Alkaline Frit (Potterycrafts P2961)
A standard material in Glazecalc's library: its oxide analysis, unity contribution and hazards.
What it is
- Kind
- Frits
- Formula
- SiO₂ 50.4%, B₂O₃ 25.2%, MgO 0.1%, Al₂O₃ 7.3%, Na₂O 12.1%, K₂O 3.4%, CaO 0.2%
- Also called
- Standard Alkaline Frit, Potterycrafts P2961
- Sold in
- UK
- Source
- Potterycrafts 'Standard Alkaline Frit' product page
Sodium borosilicate frit with about 25% B2O3 and almost no lime, recommended for copper turquoise glazes. Expansion 6.9 x 10^-6/°C, firing range 900-1100 °C.
Oxide analysis and unity formula
Glazecalc has the analysis of Standard Alkaline Frit (Potterycrafts P2961) as weight percent of the raw material. The unity contribution is the moles of each oxide in the amount of Standard Alkaline Frit (Potterycrafts P2961) that holds 1.0 mole of flux, which is how Glazecalc adds it into a recipe's unity formula.
| Oxide | Weight % | Unity contribution |
|---|---|---|
| SiO₂ | 50.4 | 3.534 |
| B₂O₃ | 25.2 | 1.525 |
| MgO | 0.1 | 0.010 |
| Al₂O₃ | 7.3 | 0.302 |
| Na₂O | 12.1 | 0.822 |
| K₂O | 3.4 | 0.152 |
| CaO | 0.2 | 0.015 |
- Equivalent weight
- 421.28
- Fired weight
- 421.28
- Loss on ignition
- 0%
The equivalent weight is the grams of Standard Alkaline Frit (Potterycrafts P2961) that hold 1.0 mole of flux. The fired weight is what is left of that after firing.
Hazards and safety
Hazards: Not classified (Potterycrafts SDS P2961); breathing the dust over long periods raises the risk of lung disease.
Use it in a recipe
Add Standard Alkaline Frit (Potterycrafts P2961) to a recipe in the Glazecalc calculator to see what it does to a glaze's unity formula.