Name: Aluminum Sulfate

Other names: aluminum sulfate (3:2); alum, aluminum sulfate

Chemical formula: Al2O12S3

Molecular weight: 342.15

CAS Registry Number: 10043-01-3

EINECS accession number: 233-135-0

Melting point: 770 °C (dec.)(lit.)

Water solubility: soluble

Density 2.71 g/mL at 25 °C(lit.)

External view: odorless, white, hygroscopic, shiny crystal or powder.

Application: Used in the production of artificial gems and high-grade ammonium alum.

The main purpose

1. Used as a paper sizing agent in the paper industry to enhance the water resistance and impermeability of paper;

2. After being dissolved in water, the fine particles and natural colloidal particles in the water can be coagulated into large flocs, which can be removed from the water, so it is used as a coagulant for water supply and wastewater;

3. Used as turbid water purifier, also used as precipitating agent, fixing agent, filler, etc. Used as raw material of antiperspirant cosmetics (astringent) in cosmetics;

4. In the fire protection industry, it forms a foam fire extinguishing agent with baking soda and foaming agent;

5. Analytical reagents, mordants, tanning agents, grease decoloring agents, wood preservatives;

6. Stabilizer for albumin pasteurization (including liquid or frozen whole eggs, white or egg yolk);

7. It can be used as a raw material for the manufacture of artificial gems, high-grade ammonium alum, and other aluminates;

8. In the fuel industry, it is used as a precipitant in the production of chrome yellow and lake dyes, and at the same time it plays a role of fixing and filling.