Molekula
Aluminium hydroxide
Supplying 4,500+ customers in over 80 countries
ISO 9001:2015 & ISO 14001:2015 certified · Supplying laboratories and industry since 2000 · Listed pack sizes are a starting point — we manufacture, source and repack to the quantity you need
Aluminium hydroxide is a white, amphoteric powder used as a flame retardant, antacid, and in the production of aluminium metal. It is also employed in water treatment and as a filler in polymers. Available in powder form with a molecular weight of 78.00 g/mol, it has a CAS number of 21645-51-2 and a molecular formula of H3AlO3. Stable at ambient temperatures, it requires no special storage conditions and carries no signal word. Molekula supplies Aluminium hydroxide from research to bulk quantities with full documentation and ISO 9001:2015 traceability.
Example image for illustration only. Other packaging and pack sizes are available.
Pricing & pack sizes
These pack sizes aren't a limit. Molekula manufactures, sources and repacks to order — if you need 500 kg and only see 1 kg listed, . We quote from grams to multi-tonne.
Need a different size? Add the nearest pack and change the size in your basket — we price it at the same rate per unit.
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500 g — £24.00 per pack ex VAT · £28.80 inc. VAT
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1 kg — £40.30 per pack ex VAT · £48.36 inc. VAT
Need a different quantity or pack?
Tell us how much you need and when — drums, IBCs, sacks or a one-off bulk lot. We'll manufacture or source it and come back with a price.
Prices exclude VAT/sales tax and shipping.
Specifications
| Property | Value |
|---|---|
| Appearance | White powder |
| Fe2O3 | 75ppm |
| Na2O | 1770ppm |
| Silicon Dioxide (SiO2) | 40ppm |
| Calcium Oxide (CaO) | 100ppm |
Storage & handling
| Property | Value |
|---|---|
| Storage Temperature | Ambient |
| Acidity | Neutral |
Literature values
Published physical properties of the substance, not batch specifications.
| Property | Value |
|---|---|
| Appearance | White, amorphous powder |
| Melting Point | 300 °C |
| Density | 2.42 g/cm³ |
| Solubility (other solvents) | Insoluble in water; soluble in alkaline solutions, acid solutions |
| Refractive Index | 1.57 |
Source: PubChem CID 10176082 (HSDB, ICSC)
Identification
| Property | Value |
|---|---|
| SKU | 23089081 |
| CAS Number | 21645-51-2 |
| IUPAC Name | aluminum trihydroxide |
| Molecular Formula | H3AlO3 |
| Molecular Weight | 78.00 |
| Exact Mass | 77.9898 |
| SMILES | [OH-].[OH-].[OH-].[Al+3] |
| InChIKey | WNROFYMDJYEPJX-UHFFFAOYSA-K |
| InChI | InChI=1S/Al.3H2O/h;3*1H2/q+3;;;/p-3 |
| PubChem CID | 10176082 |
| REACH Code | Y113 |
| TSCA Listed | Yes |
| HTS Code | 28183000 |
| Tariff Code | 281830 |
Safety & GHS
Precautionary statements
- P280 Wear protective gloves/protective clothing/eye protection/face protection
Documents
Safety Data Sheets (SDS)
Available in English, English (US), French, German, Italian, Spanish.
Certificate of Analysis (CoA) by batch
Enter a lot or batch number to retrieve the CoA for that specific batch. We can generate one from spec data if no PDF is on file.
Synonyms
- Alum Adjuvant
- Aluminium hydroxide gel, dried
- Aluminium hydroxide, dried
- aluminium(III) hydroxide
- Aluminum hydroxide gel, dried
- Aluminum hydroxide, dried
- Di-mu-hydroxytetrahydroxydialuminum
- Dried aluminium hydroxide
- Hydrated alumina
- Hydroxyde d' aluminium
Frequently asked questions
What is aluminium hydroxide used for?
Aluminium hydroxide is commonly used as a flame retardant, antacid, and in the production of aluminium metal and ceramics.
What is the chemical formula and molecular weight of aluminium hydroxide?
The formula is H3AlO3 and the molecular weight is 78.00 g/mol.
How should aluminium hydroxide be stored?
It should be stored at ambient temperature, away from moisture and direct sunlight.
What grade of aluminium hydroxide does Molekula supply?
Molekula supplies aluminium hydroxide in reagent grade, suitable for laboratory and industrial applications.
Can Molekula supply aluminium hydroxide in bulk?
Yes, Molekula can supply aluminium hydroxide in bulk quantities; please contact our sales team for pricing and availability.
What documentation comes with an order of aluminium hydroxide?
Each order includes a Certificate of Analysis (CoA) and Safety Data Sheet (SDS) with the shipment.
Ready to order or need a custom pack?
Tell us the product, grade, and quantity — Molekula usually responds within one working day with pricing and lead time.