Sodium Metabisulfite

• Category :

  Inorganic chemicals

• Synonyms :

  Sodium pyrosulfite;disodium disulphite;Sodium metabisulphite;Sodium disulphite;Sodium pyrosulphite;SODIUM DISULFITE;disodium oxidosulfanesulfonate oxide;Sodium Metabi;Metabisulfite Sodium;Sodium Metabisulfite (Food Grade);

• CAS NO :

  7681-57-4

• EC NO :

  231-673-0

• Molecular Formula :

  Na₂S₂O₅

• Molecular Weight :

  190.1065

• Main Specifications :

• InChI :

  InChI=1/2Na.H2O5S2/c;;1-6(2)7(3,4)5/h;;(H,1,2)(H,3,4,5)/q2*+1;/p-2

• Product description :

  Property: white or light yellow crystal powder, a strong smell of sulfur dioxide,relative density is 1.4, easy to dissolve in water and glycerin, water solution. It has acidity,and its solubility will become large while raising the temperature and is less to dissolve in ethanol.
  Molecular Formula : Na₂S₂O₅
  Molecule Weight : 190.12
  CAS NO .: 7681-57-4
  Appearance : White Free Flowing Fine Crystal or Powder
  Packing: Packed in 25kg plastic woven bag, 25kg Kraft paper bag, 25kg PE bag, 500kg/1000kg/1100kg/1200kg jumbo bag or as per the buyer's requirement.
   
  Specification For Food Grade and Industry Grade :
   

  Item	Quality Index
  	Food Grade	Industry Grade
  Purity ( As Na2S2O5)	98.0% min	96.0% min
  Sulfur Dioxide( SO2)	65.0% min	65.0% min
  Arsenic ( As )	0.0002% max	-
  Heavy metals ( As Pb )	0.0005% max	-
  Selenium (Se )	0.0005% max	-
  Iron (Fe)	0.001% max	0.002% max
  Water insoluble	0.02% max	0.05% max
  PH value :	4.0-4.8	4.0-4.8
  Remark :	Conformed with FCC V and E 223 Standard

   
  Specification for Pharmaceutical Grade and Photo Grade  

  Item	Quality Index
  	Pharmaceutical Grade	Photo Grade
  Purity ( As Na2S2O5)	98.0% min	98.0% min
  Sulfur Dioxide( SO2)	65.0% min	65.0% min
  Thiosulphate ( As S2O3) :	0.05 % max	0.05% max
  Chloride ( As CL-) :	30 ppm max	50ppm max
  Arsenic ( As ) :	1ppm max	1ppm max
  Lead ( Pb ) :	1 ppm max	2ppm max
  Copper (Cu) :	1 ppm max	1ppm max
  Iron (Fe ) :	5 ppm max	5ppm max
  Mercury (Hg) :	0.1ppm max	1ppm max
  Chromium (Cr) :	1 ppm max	-
  Selenium (Se ) :	1 ppm max	5ppm max
  Zinc (Zn)	1 ppm max	1ppm max
  Cadmium (Cd )	1ppm max	-
  Nickel (Ni)	1ppm max	-
  Na2SO3 + Na2SO4	1.5% max	-
  PH value :	4.0-4.8	4.0-4.8
  Remark :	Conformed with USP standard

   
  Application:
  (1) Food Grade: Bleach agent (e.g. candies, cake, bamboo shoots, etc); Loose agent (e.g. bread, cracker etc); Antiseptic and germicide (e.g. fruit juice, tinned food, brews, the cereals food is defended storage etc); Inhibitor and freshen agent (e.g. day lily, seafood, fruit and vegetable etc).
  (2) Industry Grade: Mordant of printing and dyeing; Dechlorinate of textile after bleaching; Sulphonated agent and reducer of chemical industry and pharmacy; Bleach of paper pulp, bamboo and timber bleach of Stap; Treatment agent of waste water; Rubber solidifying agent Perfume industry is served as hydro carbon perfume aldehyde
  The hide profession employ to do to molt dose and pliable dose and wearproof dose; sewage treatment, and so on .
  (3) Pharmaceutical Grade: In chemical synthesis in the production of acrylic fibre, vitamin K, vitamin A, pharmaceutical intermediates, etc.
  (4) Photo Grade: The sensitize industry is served as the developing agent reductant and the protection of fixing bath dose.
  Storage: Store the product in a dry and cool place.

• Molecular Structure :