Spring Chemical Group Corporation

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Molecular formula	Na₂S₂O₅
Molecular weight	190.1
Properties	white or light yellow crystalline powder or small crystal, with SO₂odor,Sg 1.4
Uses	Used in drug, food, ferment, rubber, textile, photo, flavor, dyes, tannage and preservativeof fruit and vegetable.

Technical index	High pure grade	Industrial grade	Food grade
Technical index	Sodium metabisulphite	Premium grade	Sodium metabisulphite
Na₂S₂O₅ ≥ %	97.5	96.0	96.0
Fe ≤ %	0.003	0.005	0.005
Water insoluble matter ≤ %	0.01	0.05	0.03
Chloride(Cl) ≤ %	0.003	--	--
Heavy metals(Pb) ≤ %	0.001	--	0.001
As ≤ %	0.0001	0.0001	0.0001
PH	3.2-4.6	-	3.2-4.6