Sodium Metabisulfite
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 |
Food Grade |
Industry Grade |
| Purity(As Na2S2O5) |
≥98.0% |
≥97.0% |
≥96.0% |
| Sulfur Dioxide(SO2) |
≥65.0% |
≥65.0% |
≥65.0% |
| Arsenic(As) |
≤0.0002% |
-- |
≤0.0001% |
| Heavy Metals(As Pb) |
≤0.0005% |
-- |
-- |
| Selenium(Se) |
≤0.0005% |
-- |
-- |
| Iron(Fe) |
≤0.002% |
≤0.005% |
≤0.005% |
| Water Insoluble |
≤0.02% |
≤0.05% |
≤0.05% |
| PH Value |
4.0-4.8 |
4.0-4.8 |
4.0-4.8 |
| Remark |
Conformed with FCCV and E223 Standard |
Specification for Pharmaceutical Grade and Photo Grade
| Item |
Pharmaceutical Grade |
Photo Grade |
| PURITY(AS Na2S2O5 ) |
≥96.0% |
≥96.5% |
| SULFUR DIOXIDE(SO2) |
≥65.0% |
≥65.0% |
| CHLORIDE(As NaCL) |
≤0.003% |
≤0.005% |
| ARSENIC(As) |
≤0.0001% |
≤0.0001% |
| HEAVY METALS(As Pb) |
≤0.0005% |
≤0.0008% |
| SELENIUM(Se) |
≤0.0001% |
≤0.0005% |
| IRON(Fe) |
≤0.001% |
≤0.001% |
| Copper(Cu) |
≤0.0001% |
≤0.0001% |
| Nickel(Ni) |
≤0.0001% |
-- |
| WATER INSOLUBLE |
≤0.01% |
≤0.01% |
| PH VALUE: |
4.0-4.8 |
4.0-4.8 |
|
