sodium pyrosulfite

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Detailed Product Description

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We are a well-known factory in China,

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Industridal grade sodium pyrosulfite

Specifications

1. Purity: 97% min

2.CAS NO: 7681-57-4

3. Molecule weight: 190.12 

4. Molecular Formula: Na2S2O5 

Use  

Major use in industrial production, including dye, organic synthesis, printing, leather, pharmacy and so on. 

Specification For Food Grade and Industry Grade :

Item	Quality Index
	Food Grade	Industry 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
Remark :	Conformed with FCC V and E 223 Standard

sodium pyrosulfite