Alberta Slip
A standard material in Glazecalc's library: its oxide analysis, unity contribution and hazards.
What it is
- Kind
- Clays
- Formula
- CaO 5.9%, K₂O 3.5%, MgO 3.9%, Na₂O 2.2%, TiO₂ 0.3%, Al₂O₃ 15.2%, P₂O₅ 0.1%, SiO₂ 53.54%, Fe₂O₃ 4.5%, LOI 9.2%
- Also called
- Alberta Slip Clay, ABSLIP
- Made by
- Plainsman Clays Ltd. (Medicine Hat, Alberta, Canada)
- Sold in
- CA, US
- Replaces
- Albany Slip
- Source
- Plainsman Clays product data page 'Alberta Slip' (archived 24 Feb 2026; the live page was removed in a 2026 site redesign) (2026-02)
A blended iron-bearing slip clay that Plainsman has made since 1988 as a substitute for Albany slip. On its own it melts to a glossy brown at cone 10 (tenmoku in reduction) and needs about 20% frit at cone 6; use a roasted and raw mix in high-percentage recipes to avoid drying cracks.
Oxide analysis and unity formula
Glazecalc has the analysis of Alberta Slip as weight percent of the raw material. The unity contribution is the moles of each oxide in the amount of Alberta Slip that holds 1.0 mole of flux, which is how Glazecalc adds it into a recipe's unity formula.
| Oxide | Weight % | Unity contribution |
|---|---|---|
| CaO | 5.9 | 0.383 |
| K₂O | 3.5 | 0.135 |
| MgO | 3.9 | 0.352 |
| Na₂O | 2.2 | 0.129 |
| TiO₂ | 0.3 | 0.014 |
| Al₂O₃ | 15.2 | 0.543 |
| P₂O₅ | 0.1 | 0.003 |
| SiO₂ | 53.54 | 3.245 |
| Fe₂O₃ | 4.5 | 0.103 |
- Equivalent weight
- 364.13
- Fired weight
- 330.63
- Loss on ignition
- 9.2%
The equivalent weight is the grams of Alberta Slip 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 Alberta Slip to a recipe in the Glazecalc calculator to see what it does to a glaze's unity formula.