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Sodium Metabisulfite
Other name：Sodium pyrosulfite
Quality standard：FCCV/E223/USP
CAS NO.：7681-57-4
HS CODE：28321000
M.F.：Na2S2O5
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.
Specifications：
| Item | 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 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 | |
Usage：
(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：
