Redart
A standard material in Glazecalc's library: its oxide analysis, unity contribution and hazards.
What it is
- Kind
- Clays
- Formula
- Al₂O₃ 16.4%, SiO₂ 64.2%, Fe₂O₃ 7%, TiO₂ 1.1%, MgO 1.6%, CaO 0.2%, Na₂O 0.4%, K₂O 4.1%, LOI 5%
- Also called
- Red Art, RedArt Clay, Cedar Heights Redart
- Made by
- Resco Products, Inc., Cedar Heights Clay Division, Oak Hill, Ohio
- Sold in
- US, AU
- Source
- Resco Products, Product Data: Redart Clay (brand code 0278), updated 07/30/19 (2019-07)
A red-burning, iron-rich Ohio earthenware clay, air-floated to 200 mesh. In glazes it is a source of iron (about 7% Fe2O3) and alkali, used up to 60% in some brown and slip-type glazes.
Oxide analysis and unity formula
Glazecalc has the analysis of Redart as weight percent of the raw material. The unity contribution is the moles of each oxide in the amount of Redart that holds 1.0 mole of flux, which is how Glazecalc adds it into a recipe's unity formula.
| Oxide | Weight % | Unity contribution |
|---|---|---|
| Al₂O₃ | 16.4 | 1.725 |
| SiO₂ | 64.2 | 11.459 |
| Fe₂O₃ | 7 | 0.470 |
| TiO₂ | 1.1 | 0.148 |
| MgO | 1.6 | 0.426 |
| CaO | 0.2 | 0.038 |
| Na₂O | 0.4 | 0.069 |
| K₂O | 4.1 | 0.467 |
- Equivalent weight
- 1072.44
- Fired weight
- 1018.82
- Loss on ignition
- 5%
The equivalent weight is the grams of Redart that hold 1.0 mole of flux. The fired weight is what is left of that after firing.
Hazards and safety
Hazards: Contains crystalline silica (quartz); do not breathe the dust.
Use it in a recipe
Add Redart to a recipe in the Glazecalc calculator to see what it does to a glaze's unity formula.