Name: Aluminum potassium sulfate dodecahydrate

English name: Aluminum potassium sulfate dodecahydrate; Kalinite;

Other name: potassium alum dodecahydrate, potassium alum dodecahydrate

Chemical formula: KAl (SO₄) ₂ · 12H₂O

Molecular weight: 474.388399

CAS Registry Number: 7784-24-9

EINECS registration number: 233-141-3

Melting point: 92 ° C

Boiling point: 200 ° C

Water solubility: soluble (solubility: about 5.90g)

Density: 1.757g / cm3

Outlook: colorless cubic crystal, often octahedral in appearance

Should be used: as a water purification agent, fire extinguishing agent, medicine, buffering agent; preparation of aluminum salts, paints, tanning materials

CID: 62667

Dangerous Goods Sign: Xn: Harmful

Risk term: R22; R36 / 38;

Security term: S26; S37 / 39;

Molar mass: 474.388399 g / mol

Application field

Extinguishing agent: Excessive alum is to make the baking soda in the fire extinguisher fully react and release enough carbon dioxide to achieve the purpose of extinguishing fire.

Puffing agent: When fried dough sticks (cakes) or puffed foods, adding baking soda to the flour and then adding alum will accelerate the production of carbon dioxide and greatly speed up the puffing speed.

Buffer: It can be used as a buffer in sulfate zinc plating to stabilize the pH value of the plating solution.