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Specification:
IS: 252-1991 (reaffirmed in 1996).
Description: Caustic soda is supplied in
the form of a solution and is free from dirt,
foreign matter and other visible impurities.
Relative
density: 150 (approximately).
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Characteristics
|
Requirements
(on dry basis) |
Units |
| Sodium
carbonate (as Na2CO3)
|
2.0
|
%,
min |
| Sodium
hydroxide (as NaOH) |
95.0
|
%,
min |
| Chlorides
(as NaCl) |
3.5
|
%,
max |
| Sulphates
(as Na2SO4) |
3.5
|
%,
max |
| Iron
(as Fe) |
3.5
|
PPM**,
max |
| Matter
insoluble in water |
0.02
|
%,
max |
**
PPM
is parts per million; to convert % to PPM, multiply
% into 10,000; 1 PPM is 1/ 10,00,000.
Properties
and storage:
Caustic soda rapidly absorbs moisture and carbon
dioxide from the air and gets partially converted
to sodium carbonate. It generates considerable
heat while dissolving in water, or when the solution
is mixed with an acid.
Caustic
soda is very corrosive to animal and vegetable
tissue. It is soluble in water, 1 kg requiring
0.9 litre at room temperature and 0.3 litre at
boiling point.
Uses: Being a versatile alkali, caustic
soda finds application in a variety of industries,
of which rayon cellophane, soap, pulp and paper
form the major ones. It is also used in the preparation
of dyes, cosmetics, pharmaceuticals and soap bleaches,
chemical manufacture, textile processing, regenerating
ion exchange resins, etching and electro-bleaches.
Hazards: Corrosive and a strong irritant
to tissues (eyes, skin, mucous membranes). Highly
toxic if injected.
Packing: In truck tankers.
For
more information about this product or to place
orders, please contact:
ZN Langrana at
znlangrana@tatachemicals.com
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