Alum BP

AbstractAlum BP
An alum is a type of chemical compound, usually a hydrated double sulfate salt of aluminium. It often refers to potassium alum, with the formula KAl(SO4)2·12H2O. 


The most widely used alum is potassium alum. It was used since antiquity as a flocculant to clarify turbid liquids. Used as pickling agent to help keep pickles crisp.


Chemical Name: Aluminium Potassium Sulphate Dodecahydrate
Mol. Formula: AlK(SO4)2.12H2O
Mol. Weight: 474.4 g/mol
CAS No.: 7784-24-9


General Specifications

Test Specification
Characters A granular powder or colorless, transparent, crystalline masses

Test (A)

Test (B)



(a)Gives reaction of sulphates

(b)Gives reaction of aluminum

(c)Shake 10ml of solution with 0.5g of sodium bicarbonate and filter. The filtrate gives the reaction of potassium

Solubility Freely soluble in water, very soluble in boiling water, soluble in glycerol, practically insoluble in ethanol 96%
Appearance of solution Solution is clear and colorless
pH The pH of the solution is 3.0-3.5
Ammonium Not more than 0.2%
Iron Not more than 100ppm
Heavy Metals Not more than 20ppm
Assay Not less than 99.0% and not more than 100.5% of AlK(SO4)2,12H2O


Shelf life, Storage and Packing

It should be stored in a segregated area in a cool and ventilated place away from combustible materials. Keep in a tightly closed container, sealed until ready for use. It is packed in 25kg or 50kg HDPE bags or drums as required.


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We observe WHO Good manufacturing practice and Good laboratory practice.

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