Talc
A standard material in Glazecalc's library: its oxide analysis, unity contribution and hazards.
What it is
- Kind
- Fluxes
- Formula
- 3MgO•4SiO₂•H₂O
- Source
- Theoretical formula
Oxide analysis and unity formula
Glazecalc has the analysis of Talc as moles of each fired oxide per formula. The unity contribution is the moles of each oxide in the amount of Talc that holds 1.0 mole of flux, which is how Glazecalc adds it into a recipe's unity formula.
| Oxide | Moles | Unity contribution |
|---|---|---|
| MgO | 3 | 1.000 |
| SiO₂ | 4 | 1.333 |
- Equivalent weight
- 126.42
- Fired weight
- 120.41
- Loss on ignition
- 4.75%
The equivalent weight is the grams of Talc 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 SDS 54; CTM's pottery talc is about 55–60% talc and 40–45% magnesium carbonate, under 1% quartz); avoid breathing the dust.
Use it in a recipe
Add Talc to a recipe in the Glazecalc calculator to see what it does to a glaze's unity formula.