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Chemical Composition of Ferric Alum

 

 

Characteristic

 Requirement

 Grade 1

 Grade 2

 Grade 3

1.

Insoluble matter % by mass, Max

0.5

0.5

0.25

2.

Soluble Iron compound, % by mass, Max *

0.7

0.7

0.35

3.

Water soluble aluminum compound as Al2O3 percentage by mass, min

16.0

15.0

7.5

4.

pH of 5% aqueous solution, min

2.7

2.7

2.7

5.

Basicity (as Al2O3), % by mass, Max **

0.5

0.5

0.25

6.

Additional requirements for material required for purification of water

 

 

 

7.

Lead (as Pb) parts per million, max

30

30

15

8.

Arsenic (as As2O3) parts per million

6

6

3

* soluble iron compounds (as Fe) , percent be mass , Max permissible for water purification purposes only shall be 1.0 for Grades 1 and 2 and 0.5 for Grade 3

** the material of Grade 2 can also be supplied as having free acidity (as H2SO4) of 0.5% by mass, Max, if required by the purchaser, the pH in this case shall not be less than 2

 

 

Chemical composition of Non-Ferric Alum

 

 

Characteristic

Requirement

Technical Grade

Pure Grade

AR Grade

1.

Insoluble matter % by mass, Max

0.30

0.02

0.005

2.

pH (of 5% Solution), min

2.8

2.9

2.2

3.

Heavy metals (as pb), parts per million, max

-

4

10

4.

Iron (as Fe), percent by mass, max

0.01

0.004

0.002

5.

Chlorides

-

-

to pass test

6.

Arsenic (as As2O3) parts per million

-

8

5

7.

Ammonium Salts (as NH3), percent by mass, max

-

0.025

0.025

8.

Aluminum (as Al2O3), percent by mass

17 min

16.6 - 17.6

16.6 - 17.6

9.

Sodium (as Na) percent by mass, max

-

-

0.05

10.

Potassium (as K) percent by mass, max

-

-

0.01

 

Uses:
Technical Grade (TECH) – used as a mordant in the dyeing of textiles and as a loading material for better grades of paper

Pure Grade B – used in pharmaceutical preparations and where pure grade of the material is required  namely for clarifying oils and fats , preparation of aluminum resonates and other pure aluminum salts

Analytical reagent (AR)  – for use as a reagent in chemical analysis

 

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