Standard Borax Frit (Potclays 2263)
A standard material in Glazecalc's library: its oxide analysis, unity contribution and hazards.
What it is
- Kind
- Frits
- Formula
- K₂O 1.33%, Na₂O 8.75%, CaO 15.22%, MgO 0.05%, Al₂O₃ 7.54%, SiO₂ 48.34%, B₂O₃ 18.76%
- Also called
- Standard Borax Frit, SBF, Borax Frit, Potclays 2263, Bath Potters STAB, CTM 36 Standard Borax Frit
- Sold in
- UK
- Similar materials
- Borax Frit (Potterycrafts P2953) , Ferro Frit 3124 , Ferro Frit 3134
- Source
- Potclays, 'Frit Formulae' technical sheet (John Beeston, January 2010), Internet Archive copy of 2013 (2010-01)
The leadless frit most used in UK earthenware glazes: a calcium borosilicate with about 19% B2O3. Firing range 900-1050 °C (Bath Potters) or 950-1150 °C (Potclays).
Oxide analysis and unity formula
Glazecalc has the analysis of Standard Borax Frit (Potclays 2263) as weight percent of the raw material. The unity contribution is the moles of each oxide in the amount of Standard Borax Frit (Potclays 2263) that holds 1.0 mole of flux, which is how Glazecalc adds it into a recipe's unity formula.
| Oxide | Weight % | Unity contribution |
|---|---|---|
| K₂O | 1.33 | 0.033 |
| Na₂O | 8.75 | 0.330 |
| CaO | 15.22 | 0.634 |
| MgO | 0.05 | 0.003 |
| Al₂O₃ | 7.54 | 0.173 |
| SiO₂ | 48.34 | 1.880 |
| B₂O₃ | 18.76 | 0.630 |
- Equivalent weight
- 233.67
- Fired weight
- 233.67
- Loss on ignition
- 0%
The equivalent weight is the grams of Standard Borax Frit (Potclays 2263) that hold 1.0 mole of flux. The fired weight is what is left of that after firing.
Hazards and safety
Hazards: Not classified (CTM Standard Borax Frit SDS 36, used as the equivalent); avoid breathing the dust.
Use it in a recipe
Add Standard Borax Frit (Potclays 2263) to a recipe in the Glazecalc calculator to see what it does to a glaze's unity formula.