Sodium pyrosulfite

Product Description

Physical character: White or tiny yellow crystal or crystal powder. Has sulfurous acid smell. Relative density 1.4. Dissolve in water , aqueous solutions is acidity. Dissolve in glycerin , appreciably dissolve in alcohol. Decomposition easy to touch with damp , divulge on the air easy to become sodium sulfate. Get in touch with strong acid put out sulfur dioxide and generate corresponding salt. Heat to **0 centigrade decomposes. Use: Be used as decolourant, mordant, reducing agent, latex concreting reagent, and also be used for organic synthesis , pharmacy and spice etc. Production method: Absorb method use soda ash solution to absorb the sulfur dioxide , get sodium pyrosulfite by the abruption and dry . . Our company's specification: Sodium sulfite ( as SO2), %******5.0 Min Fe % **************************************** .0.**5 Max Water-insoluble Matters %*****.0.*5 Max Heavy metal (Pb) %********************0.**2 Max Arsenic ( As) %******************** *****0.***2 Max Appearance*************************************************************************** *****. White or tiny yellow crystal or crystal powder PH*********************************************. . 4.**4.6