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Formula:
Na2SO3
Properties: Sodium Sulfite is a reducing
agent soluble in water. Its solution in water is basic.
It is feeble soluble in liquid chlorine or ammonia.
Usage: It is used as a desoxydating or bleaching agent
for printing and dyeing industry, as a developer for
photographic industry . as a lignin-removing agent for
paper industry, as a stabilizer for syntheticfiber for
textile industry, as a reducing agent for chemical industry,
or for electroplating industry etc.
Executive standard: HG/T 2967-2000 《Sodium
Sulfite》
|
Ttems |
Norms (industrial grade) |
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Superior-grade |
First-grade |
Qualified-grade |
|
Na2SO3
-content % ≥ |
97.0
|
96.0
|
93.0
|
|
Fe-content % ≤ |
0.003 |
0.005 |
0.02 |
|
Water-insoluble matter content % ≤ |
0.02
|
0.03
|
0.05
|
|
Free alkali
（
as Na）content
% ≤ |
0.10
|
0.40
|
0.80
|
|
Na2SO4-content
% ≤ |
2.5
|
—— |
—— |
|
NaCL-content % ≤ |
0.10
|
—— |
—— |
Package Storage and transportation:
（1）Plastic film-lined PP woven bag, Net
weight per bag: 25Kg or 50Kg.
（2）Not allowed in a room with any oxidant or strong
acid, and keep away from an oxidation by air or humidity.
（3）Keep away from sunlight and humidity during its transportation.
（4）Storage life: no more than half year from ex-factory
date.
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