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Details for China Sodium Metabisulfite

Sodium Metabisulfite 7681-57-4

Category :

Inorganic chemicals

Sodium Metabisulfite
CAS NO : 7681-57-4
EC NO : 231-673-0
MF : Na2S2O5
MW : 190.1065
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
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
Synonyms : Sodium pyrosulfite;disodium disulphite;Sodium metabisulphite;Sodium disulphite;Sodium pyrosulphite;SODIUM DISULFITE;disodium oxidosulfanesulfonate oxide;Sodium Metabi;Metabisulfite Sodium;
Molecular Structure : Sodium Metabisulfite 7681-57-4