Products details:

Classification:Sulphate
Type:Sodium Sulfite
MF:Na2SO3
CAS No.: 7757-83-7
Purity: 96%/93%

Packing:25 KG gunny bag with poly bag inside.
Molecular formula:Na2SO3
Molar mass:126.043 g/mol
Appearance:white solid, or powder
Density:2.633 g/cm3 (anhydrous)
             1.561 g/cm3 (heptahydrate)
Melting point:33.4 °C (dehydration of heptahydrate)
                     500°C (anhydrous)
Boiling point: Decomposes in : 67.8 g/100 ml (18 °C, heptahydrate)
Applications:Sodium sulfite is primarily used in the pulp and paper industry. It is used in water treatment as an oxygen scavenger agent, in the photographic industry to protect developer solutions from oxidation and (as hypo clear solution) to wash fixer () from film and photo-paper emulsions, in the textile industry as a bleaching, desulfurizing and dechlorinating agent and in the leather trade for the sulfidization of tanning extracts. It is used in the purification of for military use. It is used in chemical manufacturing as a sulfonation and sulfomethylation agent. It is used in the production of . It is used in other applications, including of ores, , food preservatives, making dyes.

Product Specification:
Item-----------------------------------------------------Tech grade
Sodium sulfite (Na2SO3) content, %--------------97.0 min
Iron (Fe) content, %----------------------------------0.003 max
Water-insoluble content, %--------------------------0.02 max
Free base (in terms Na2SO3) content, %----------0.10 max
Sulfate (Na2SO4 in total) content, %--------------2.5 max
Chloride (NaCl in dollars) content, %-------------0.10 max