Sodium Sulfite Anhydrous
Sodium Sulfite Anhydrous
Sodium Sulfite Anhydrous  
Molecular Formula :Na2SO3
Molecule Weight :126.04
CAS NO .:7757-83-7
Appearance :White Free Flowing Fine Crystal or Powder
Property: white gravel or powder crystal,relative density is 1.561, less to dissolve in water and its water solution has alkaline reaction; it is hard to dissolve in ethanol. It is used to produce chloroform, solasulfone and Benzaldehyde in medical industry.
Specification for Industry Grade and Food Grade :
Item Industry Grade Food Grade
Purity ( As Na2SO3) 96.0% min 98.0% min
Sodium sulphate ( SO4) 2.0% max 1.0% max
Chlorides ( As NaCL) 0.5% max 0.1% max
Arsenic ( As ) - 0.0002% max
Heavy metals ( As Pb ) - 0.0005% max
Iron (Fe) 0.005% max 0.002% max
Water insolubles 0.05% max 0.02% max
Specification For Photo Grade and Pharmaceutical Grade
Item Photo Grade Pharmaceutical Grade
Purity ( As Na2SO3) 98.0% min 98.0% min
Sodium sulphate ( SO4 ) 1.0% max 1.0% max
Chlorides ( As CL-) 0.05% max 0.05% max
Arsenic ( As ) 0.0002% max 2ppm max
Lead ( As Pb) 0.0005% max 2ppm max
Iron (Fe) 0.001% max 5ppm max
Selenium ( Se) 0.0001% max 1ppm max
Zinc ( Zn) 0.0001% max 1ppm max
Copper ( Cu ) 0.0001% max 0.1ppm max
Mercury ( Hg) 0.0001% max 0.1 ppm max
Application :
  1. Industry Grade : Used in Dyeing and printing Industry ,as dechlorinating agent and bleaching agent, in leather and tanning industry as bleaching agent , developer agent , reductant agent , stabilizer agent , or used in papermaking, electronic and water treatment industry.
  2. Food Grade: In food industry as additive (E223) preservative, antioxidant and antimicrobic for fruits (dried, glazed and candled), vegetables (onions, potatoes, etc.), juices (citrus and grapes) and fish (shrimps and prawns). In silage treatment as antifermentative. In starch and sweeteners production as bacteriostatic.
  3. Photo Grade: In the photographic industry as component of developer bath .
  4. Pharmaceutical Grade : pharmaceutical industry for the production of chloroform, benzene and formaldehyde phenylpropanoid Sulfone
  5. It is also used as a preservative to prevent dried fruit from discoloring, and for preserving meats, and is used in the same way as sodium thiosulfate to convert elemental halogens to their respective hydrohalic acids, in photography and for reducing chlorine levels in pools.
Packing:Packed in 25kg plastic woven bag, Kraft paper bag, PE bag, 500kg/1000kg/1100kg/1200kg jumbo bag or as per the buyer’s requirement
Storage:Store the product in a dry and cool place.