Borax Frit (Potterycrafts P2953)
A standard material in Glazecalc's library: its oxide analysis, unity contribution and hazards.
What it is
- Kind
- Frits
- Formula
- SiO₂ 49.6%, B₂O₃ 18%, MgO 0.1%, Al₂O₃ 7.5%, Na₂O 8.8%, K₂O 1.7%, CaO 14.1%
- Also called
- Borax (E) Frit, Borax E Frit, Waterground & Dried Borax E Frit, Potterycrafts P2953
- Sold in
- UK
- Similar materials
- Standard Borax Frit (Potclays 2263)
- Source
- Potterycrafts 'Waterground & Dried Borax E Frit' product page
Potterycrafts' standard borax frit, a general-purpose leadless frit for earthenware glazes. Expansion 8.3 x 10^-6/°C, firing range 900-1100 °C.
Oxide analysis and unity formula
Glazecalc has the analysis of Borax Frit (Potterycrafts P2953) as weight percent of the raw material. The unity contribution is the moles of each oxide in the amount of Borax Frit (Potterycrafts P2953) that holds 1.0 mole of flux, which is how Glazecalc adds it into a recipe's unity formula.
| Oxide | Weight % | Unity contribution |
|---|---|---|
| SiO₂ | 49.6 | 1.994 |
| B₂O₃ | 18 | 0.625 |
| MgO | 0.1 | 0.006 |
| Al₂O₃ | 7.5 | 0.178 |
| Na₂O | 8.8 | 0.343 |
| K₂O | 1.7 | 0.044 |
| CaO | 14.1 | 0.607 |
- Equivalent weight
- 241.57
- Fired weight
- 241.57
- Loss on ignition
- 0%
The equivalent weight is the grams of Borax Frit (Potterycrafts P2953) 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 P2953; under 1% quartz); breathing the dust over long periods raises the risk of lung disease.
Use it in a recipe
Add Borax Frit (Potterycrafts P2953) to a recipe in the Glazecalc calculator to see what it does to a glaze's unity formula.