Product Description
Aluminium Potassium Sulfate Dodecahydrate, commonly known as alum, is a classic inorganic aluminum salt. Integrating antibacterial, astringent, flocculating and fixing properties, it is widely used in medicine, food, environmental protection and light industry. Notably, excessive long-term intake will cause aluminum accumulation in the human body, interfering with iron and calcium absorption and potentially inducing anemia and osteoporosis.
Product Parameters
| English name | Aluminium potassium sulfate dodecahydrate |
| English synonyms | POTASSIUM ALUMINIUM SULFATE 12-WATER;POTASSIUM ALUMINIUM SULFATE DODECAHYDRATE:POTAS SIUM ALUM:POTASSIUM ALUMINUM SULFATE DODECAHYDRATE:POTASSIUM ALUM SULFATE, DODECAHY DRATE;POTASSIUM ALUM DODECAHYDRATE;POTASSIUM AMMONIUM SULFATE;aluminumpotassiumdisulf atedodecahydrate |
| CAS number | 7784-24-9 |
| Molecular formula | AIH8KO5S |
| Molecular weight | 186.2 |
| EINECS number | 616-521-7 |
| Melting point | 92°C (lit.) |
| Boiling point | 200°C |
| Density | 1.757 g/mL at 25°C (lit.) |
| Bulk density | 900 kg/m³ |
| Storage conditions | Store at +5°C to +30°C |
| Solubility | H2O: 0.5M, clear, colorless |
| Form | Solid |
| Specific gravity | 1.757 |
| Color | White |
| Odor | Odorless |
| pH | 3.0-3.5 (25°C, 50 mg/mL in H2O) |
| Water solubility | 140 g/L (20°C) |
| Merck | 14,360 |
| Stability | Stable. Incompatible with steel, aluminum, copper, zinc, alkalis, and strong oxidizers. |
| LogP | -1.031 (est.) |
Application Scenarios
Medical & Healthcare Industry – Used as a topical astringent, hemostatic agent and preservative. It exerts antibacterial and anti-parasitic effects and acts as an auxiliary therapeutic material for multiple physical discomforts.
Industrial Manufacturing – Applied as a water purification flocculant for turbid water treatment, a rosin sizing agent in papermaking, and a mordant and anti-dye agent in textile printing. It also serves as a photographic film hardener, rubber foaming auxiliary and tanning agent.
Food Industry – Utilized as a traditional food additive and leavening auxiliary ingredient for baking powder production, with strict dosage control required for safe use.
