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Specifications

Commodity: Sodium Metabisulphite
Molecular Formula : Na2S2O5
Molecule Weight : 190.12

CAS NO .: 7681-57-4

HS Code: 28321000
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.
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.
　
 
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.