Product Description
Alum, mainly composed of potassium aluminum sulfate dodecahydrate, has antibacterial and astringent properties and is used in Traditional Chinese Medicine. It is traditionally believed to have detoxifying, insecticidal, moisture-reducing, antipruritic, hemostatic, antidiarrheal, and expectorant effects, with studies also showing antibacterial and anti-trichomoniasis activity.
It is used in some traditional treatments and widely applied in the production of aluminum salts, baking powder, paints, tanning agents, clarifiers, mordants, papermaking, and waterproofing materials. However, excessive intake of alum may cause aluminum accumulation in the body and interfere with the absorption of nutrients such as iron and calcium, potentially affecting health.
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Chemical Properties
| 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.) |
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Alum's main uses include
It is used in various industries, including papermaking, water treatment, photography, dyeing, and pharmaceuticals. In papermaking, it serves as a rosin sizing agent; in water purification, it works as a coagulant or sedimentation aid for removing turbidity. It is also used as a film hardener in photographic processing, a dye mordant and resist agent in textile printing, and a foaming aid for foam rubber production.
Additionally, it has applications as a food additive, water purifier, dye retarder, pharmaceutical preservative, astringent, and topical hemostatic agent.
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