Molekula
Aluminium potassium sulfate dodecahydrate
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 potassium sulfate dodecahydrate, also known as alum, is a crystalline compound used in water purification, dyeing, and as a mordant in textile processing. It is a double sulfate salt of aluminium and potassium with 12 water molecules of hydration. CAS: 7784-24-9, molecular formula: AlK(SO4)2·12H2O, molecular weight: 474.39 g/mol. Store at ambient temperature. Signal word: Warning. Molekula supplies Aluminium potassium sulfate dodecahydrate 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.
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1 kg — £26.30 per pack ex VAT · £31.56 inc. VAT
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Specifications
| Property | Value |
|---|---|
| Appearance | White powder |
| Heavy metals | ≤ 0.0005% |
| pH | 2.9 - 3.1 |
| Chloride (Cl-) | ≤ 0.0005% |
| Assay | ≥ 99.0% |
| Water insoluble matter | ≤ 0.005% |
| Iron (Fe) | ≤ 0.001% |
| Arsenic (As) | ≤ 0.00005% |
| Ammonium (NH4+) | ≤ 0.005% |
| Sodium (Na) | ≤ 0.005% |
Storage & handling
| Property | Value |
|---|---|
| Storage Temperature | Ambient |
| Transport Class | Not regulated |
| Acidity | Acid |
Literature values
Published physical properties of the substance, not batch specifications.
| Property | Value |
|---|---|
| Melting Point | 92.5 °C |
Source: PubChem CID 62667 (PAC Chemical Database)
Identification
| Property | Value |
|---|---|
| SKU | 21110119 |
| CAS Number | 7784-24-9 |
| IUPAC Name | aluminum;potassium;disulfate;dodecahydrate |
| Molecular Formula | AlK(SO4)2·12H2O |
| Molecular Weight | 474.39 |
| Exact Mass | 473.9755 |
| SMILES | O.O.O.O.O.O.O.O.O.O.O.O.[O-]S(=O)(=O)[O-].[O-]S(=O)(=O)[O-].[Al+3].[K+] |
| InChIKey | GNHOJBNSNUXZQA-UHFFFAOYSA-J |
| InChI | InChI=1S/Al.K.2H2O4S.12H2O/c;;2*1-5(2,3)4;;;;;;;;;;;;/h;;2*(H2,1,2,3,4);12*1H2/q+3;+1;;;;;;;;;;;;;;/p-4 |
| PubChem CID | 62667 |
| REACH Code | Y110 |
| HTS Code | 28333000 |
| Tariff Code | 2833300000 |
Safety & GHS
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Health Hazard
GHS07
Hazard statements
- H315 Causes skin irritation
- H319 Causes serious eye irritation
- H335 May cause respiratory irritation
Precautionary statements
- P261 Avoid breathing dust/fume/gas/mist/vapours/spray
- P280 Wear protective gloves/protective clothing/eye protection/face protection
- P302+352 IF ON SKIN: Wash with soap and water
- P303+361 IF ON SKIN (or hair): Remove immediately all contaminated clothing. Rinse with water/shower
- P304+340 IF INHALED: Remove victim to fresh air and keep at rest in a position comfortable for breathing
- P305+351+338 IF IN EYES: Rinse with water for several minutes. Remove contact lenses if present and easy to do. Continue rinsing
Documents
Safety Data Sheets (SDS)
Available in English, 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, potassium, dodecahydrate
- Aluminum potassium sulfate (AlK(SO4)2), dodecahydrate
- Aluminum potassium sulfate dodecahydrate
- aluminum;potassium;disulfate;dodecahydrate
- Potash alum dodecahydrate
- Potassium alum dodecahydrate
- Potassium aluminum disulfate dodecahydrate
- Potassium aluminum sulfate dodecahydrate
- Potassium aluminum sulfate dodecahydrate (KAl(SO4)2.12H2O)
- Sulfuric acid, aluminum potassium salt (2:1:1), dodecahydrate
Frequently asked questions
What is aluminium potassium sulfate dodecahydrate used for?
It is commonly used as a mordant in dyeing, in water purification, and as a coagulant in wastewater treatment.
What is the chemical formula and molecular weight?
The formula is AlK(SO4)2·12H2O with a molecular weight of 474.39 g/mol.
How should it be stored?
Store at ambient temperature, protected from moisture and heat.
What grade is available?
Available in laboratory grade; custom grades may be available upon request.
Can Molekula supply it in bulk?
Yes, bulk quantities are available—please contact our sales team for pricing and availability.
What documentation comes with the order?
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.