Sodium Metabisulfite
Basic information:
CAS NO.7681-57-4
UN No.2693
Chemical formula:Na2S2O5
Molecular weight:190.10
Character:white or yellow crystalline powder or small crystals
Dennsity:1.48g/cm3
Melting point:170℃(150℃ start to decompose)
Solubleness:soluble in water, water solution is acidic(54g/100ml water at 20℃;81.7g/100ml water at 100℃). Soluble in glycerol,slightly soluble in ethanol.
Technical Index(Mass fraction/%)
|
Items |
Index |
|
Sulfur dioxide(%） |
≥ 65 |
|
Iron（%） |
≤ 0.005 |
|
water insoluble（%） |
≤ 0.05 |
|
PH value |
4.0-4.6 |
Uses:
Used in printing and dyeing, organic synthesis,printing,leather,pharmaceutical And other departments;in food processing as preservatives,bleach,osteoporosis Agent.
Package/Capacity of container/Storage:
Packing:in 25kg/50kg bag.
Store in cool,dry and ventilated warehouse.