sodium metabisulfite Molecular formula:Na2S2O5 Cas No.:7681-57-4 Molecular Weight:190.09 Synonyms: Sodium pyrosulfite; disod

Chemical Name: Sodium Metabisulphite Appearance: White or light yellow crystalline powder. Specification: Industrial Grade and Food Grade 

Item	Quality Index
	Food Grade	Industry Grade
Purity ( As Na2S2O5)	98.0% min	96.0% 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

uses:

Mordant of printing and dyeing;dechlorinate of  textile after bleaching;sulphonated agenrt and 

reducer of chemical industry and pharmacy ;Bleach of paper pulp,bamboo and timber bleach

 of stapk treatment agent of waste water;rubber solidifying agent;perfume industry is served as 

hydrocarbon perfume aldehyde;the hide profession empoly to do molt dose and pliable dose and wear 

proof dose ; the sensitize industry is served as the developing agent reductant and the protection of

 fixing bath dose and so on;sewage treatment

sodium metabisulphite 64%