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CAS No. is 10043-01-3. Aluminum sulphate is used in water purification and as a mordant in dyeing and printing textiles. In water purfication, it causes impurities to coagulate which are  removed as the particulate settles to the bottom of the container or more easily filtered. This process is called coagulation or flocculant.

Physical properties

Appearance: colorless or white crystals, industrial products may be yellow-green due to impurities.

Melting point: 770°C (decomposition)

Boiling point: about 759.71°C (estimated value)

Density: 2.71 g/mL (25°C)

Solubility: easily soluble in cold and hot water, almost insoluble in ethanol (96%).

Uses

Papermaking: used as filler and sizing agent for papermaking, it can improve the tensile strength and water resistance of paper.

Water purification: as a water purifier, it can remove impurities such as suspended matter, colloids, organic matter, etc. in water, making the water clear and transparent.

Mordant: in the printing and dyeing industry, it is used as a mordant to make the dye adhere better to the fiber.

Tanning agent: used in leather tanning, it can make the leather soft and durable.

Medical astringent: in the medical field, it is used as an astringent to shrink blood vessels and reduce exudate.

Wood preservative: used for wood preservative treatment, it can extend the service life of wood.

Foam fire extinguishing agent: reacts with sodium bicarbonate to generate carbon dioxide, which is used for foam fire extinguishing.