Alumina Hydrate
A standard material in Glazecalc's library: its oxide analysis, unity contribution and hazards.
What it is
- Kind
- Alumina
- Formula
- Al₂O₃•3H₂O
- Also called
- Aluminum hydroxide, Aluminium hydroxide, Aluminum trihydrate, ATH, Hydrated alumina, Alumina trihydrate, Gibbsite
- Sold in
- US, UK, EU, AU
- Similar materials
- Calcined Alumina
- Source
- Theoretical composition of Al(OH)3 (Al2O3·3H2O)
Aluminum hydroxide powder used to add alumina to glazes and in kiln wash and wadding; it suspends and adheres better than calcined alumina. It loses about 35% of its weight as water near 220-300 C.
Oxide analysis and unity formula
Glazecalc has the analysis of Alumina Hydrate as weight percent of the raw material. The unity contribution is the moles of each oxide in the amount of Alumina Hydrate that holds 1.0 mole of flux, which is how Glazecalc adds it into a recipe's unity formula.
Alumina Hydrate has no flux oxide, so its unity contribution is per formula as written.
| Oxide | Weight % | Unity contribution |
|---|---|---|
| Al₂O₃ | 65.36 | 0.641 |
- Equivalent weight
- 100
- Fired weight
- 65.36
- Loss on ignition
- 34.64%
The equivalent weight is the grams of Alumina Hydrate that hold 1.0 mole of flux. The fired weight is what is left of that after firing.
Hazards and safety
Hazards: Low hazard; avoid breathing dust.
Use it in a recipe
Add Alumina Hydrate to a recipe in the Glazecalc calculator to see what it does to a glaze's unity formula.