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Sodium hydroxide in solid form, also called caustic soda, is an inorganic chemical compound belonging to the strongest alkali. In solid form, it is a white substance with crystalline appearance (flakes). It has hygroscopic properties. It is perfectly soluble in water, forming corrosive soda lye, which is accompanied by the release of significant amounts of heat.
| Composition | Unit | Acceptable Limit |
|---|---|---|
|
Purity of Sodium Hydroxide (NaOH) |
% W |
Min 98 |
|
Carbonate (as Na 2 CO 3 ) |
% W |
Max 1.0 |
|
Chloride (as NaCl) |
% W |
Max 0.06 |
|
Sulfate (as Na 2SO4) |
% W |
Max 0.01 |
|
SiO2 |
% W |
Max 0.02 |
|
Fe |
ppm |
Max 30 |
|
Insoluble in water |
% W |
Max 0.1 |
|
Aluminum (as Al2O3) |
ppm |
Max 0.1 |
|
Heavy Metals (as Pb) |
ppm |
Max 0.1 |
50 X
=
> 20 X
= 25 Tons
50 X
=
> 20 X
= 25 Tons
50 X
=
> 20 X
