Sodium metabisulfite

Sodium metabisulfite Identification Name Sodium metabisulfite Synonyms Sodium pyrosulfite; Disodium disulphite; Disulfurous acid disodium salt; Pyrosulfurous acid disodium salt Molecular Formula Na2S2O5 Molecular Weight 190.10 CAS Registry Number 7681-57-4 EINECS 231-673-0 Properties Density 1.48 Melting point 150 ºC Water solubility 540 g/L (20 ºC) Safety Data Hazard Symbols Xn Details Risk Codes R22;R31;R41 Details Safety Description S26;S39;S46 Details Appearance: white or light yellow crystal powde.. Model Number: Industrial grade & Food grade Purity: 97% Min Application: Bleach agent, Loose agent, Mordan sodium metabisulfite tech grade PROPERTIES: 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. sodium metabisulfite industrial grade Specifications: Index Content Food grade Tech grade Purity ( As Na2S2O5) 98.0% min 97.0% 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 Purity ( As Na2S2O5) 98.0% min 96.0% min