Feature Products

Sodium Metabisulfite

Other name:Sodium pyrosulfite

Quality standard:FCCV/E223/USP

CAS NO.:7681-57-4

HS CODE:28321000


Specification:Industry grade/Food grade

Appearance:White crystalline powder


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.

ItemFood GradeIndustry 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 FCCV and E223 Standard          


Item 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                     

(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) Pharm Grade: In chemical synthesis in the production of acrylic fibre, vitamin K, vitamin A, pharmaceutical
intermediates, etc..

Packing:25kg per woven bag, 1x20fcl=27mt.

Shelf life:2years

Storage:Store in a cool, dry, ventilated environment. 

Advantage on this item:big capacity, supply mix container.

Packing photos: