Fengda Chemicals Corp.

Sodium Metabisulfite

Molecular formula：Na₂S₂O₅

Molecular weight：190.12

CAS No.：7681-57-4

Property：White or light-yellow crystalline powder, smell of SO₂. No other smell when dried. Specific gravity is 1.4. It's soluble in glycerine, it's soluble slightly in alcohol.

Usage：

Food Grade: Mainly used as bleaching agent, bulking agent, antioxidant preservatives in food processing.

Tech Grade: Mainly used for producing medicine iodoform, vanillin photographic fixative, rubber solidifying agent, decolorizing agent of bleached fiber, leather treatment of leather making industry, etc.

Packing：Net in 25KG plastic woven bag.

Specification：

Item	Food Grade	Tech Grade
Sodium Metabisulfite (as SO₂)	65% Min	65% Min
Iron(Fe)	0.003% Max	0.005% Max
Insoluble matter in water	0.05% Max	0.05% Max
PH	4.0-4.6	4.0-4.6
Heavy metal(as Pb)	0.002% Max	-
Arsenic(As)	0.0002% Max	-