Albany Slip
A standard material in Glazecalc's library: its oxide analysis, unity contribution and hazards.
What it is
- Kind
- Clays
- Status
- Discontinued 1987
- Formula
- SiO₂ 57.82%, Al₂O₃ 14.63%, Fe₂O₃ 5.21%, TiO₂ 0.4%, CaO 5.81%, MgO 2.71%, K₂O 3.2%, Na₂O 0.8%, LOI 9.41%
- Also called
- Albany Slip Clay, Albany Clay, New York Slip
- Made by
- Hammill & Gillespie (mined near Albany, New York)
- Sold in
- US
- Similar materials
- Alberta Slip
- Source
- Digitalfire Reference Library: Albany Slip
A silty, iron-rich New York clay that melted by itself into a glossy dark brown glaze at cone 8 to 10 and appears in thousands of older recipes. It has been out of production since the late 1980s; use Alberta Slip in its place.
Oxide analysis and unity formula
Glazecalc has the analysis of Albany Slip as weight percent of the raw material. The unity contribution is the moles of each oxide in the amount of Albany Slip that holds 1.0 mole of flux, which is how Glazecalc adds it into a recipe's unity formula.
| Oxide | Weight % | Unity contribution |
|---|---|---|
| SiO₂ | 57.82 | 4.420 |
| Al₂O₃ | 14.63 | 0.659 |
| Fe₂O₃ | 5.21 | 0.150 |
| TiO₂ | 0.4 | 0.023 |
| CaO | 5.81 | 0.476 |
| MgO | 2.71 | 0.309 |
| K₂O | 3.2 | 0.156 |
| Na₂O | 0.8 | 0.059 |
- Equivalent weight
- 459.29
- Fired weight
- 416.07
- Loss on ignition
- 9.41%
The equivalent weight is the grams of Albany 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 Albany Slip to a recipe in the Glazecalc calculator to see what it does to a glaze's unity formula.