Calcium Borate Frit (Potclays 2268)
A standard material in Glazecalc's library: its oxide analysis, unity contribution and hazards.
What it is
- Kind
- Frits
- Formula
- Al₂O₃ 5%, B₂O₃ 50%, CaO 26.5%, SiO₂ 17.5%
- Also called
- Potclays 2268, Bath Potters CABF (new formulation)
- Sold in
- UK, AU
- Similar materials
- Calcium Borate Frit (Potterycrafts P2954) , Gillespie Borate
- Replaces
- Colemanite (theoretical)
- Source
- Potclays 'Calcium Borate Frit' product page, typical analysis (ranges)
Potclays' calcium borate frit, 'long established as the substitute for colemanite in glazes'. A damp, coarse frit; firing range 800-1100 °C, not for fast firing.
Oxide analysis and unity formula
Glazecalc has the analysis of Calcium Borate Frit (Potclays 2268) as weight percent of the raw material. The unity contribution is the moles of each oxide in the amount of Calcium Borate Frit (Potclays 2268) that holds 1.0 mole of flux, which is how Glazecalc adds it into a recipe's unity formula.
| Oxide | Weight % | Unity contribution |
|---|---|---|
| Al₂O₃ | 5 | 0.104 |
| B₂O₃ | 50 | 1.520 |
| CaO | 26.5 | 1.000 |
| SiO₂ | 17.5 | 0.616 |
- Equivalent weight
- 211.61
- Fired weight
- 211.61
- Loss on ignition
- 0%
The equivalent weight is the grams of Calcium Borate Frit (Potclays 2268) that hold 1.0 mole of flux. The fired weight is what is left of that after firing.
Hazards and safety
Hazards: Not classified (equivalent Potterycrafts P2954 SDS; Bath Potters' calcium borate frit sheet says no labelling is needed); avoid breathing the dust.
Use it in a recipe
Add Calcium Borate Frit (Potclays 2268) to a recipe in the Glazecalc calculator to see what it does to a glaze's unity formula.