CAS number:  7681-57-4  

Molecular formula: Na2S2O5  

Molecular weight: 190.12    

Item       Specification

Food Grade             Tech Grade

Appearance            White or Slightly Yellow Crystalline Powder

Content   98.0% Min              98.0% Min

SO2         65.0% Min              65.0% Min

Na2S2O4 2.0% Max               2.0% Max

Insolubles In Water               0.05% Max             0.05% Max

Particle Size            85% (Mesh 200)     85% (Mesh 200)

pH           4.5 -5.5   4 -4.6

Fe            5ppm max              5ppm max

Heavy Metal            10 ppm max           　

As            1 ppm max             　

Usage:

Food Grade: Bleach agent (e.g. candies, cake, bamboo shoots, etc); Loose agent (e.g. bread, cracker etc); Antiseptic and germicide (e.g. fruit juice, tinned food, brews, the cereals food is defended storage etc); Inhibitor and freshen agent (e.g. day lily, seafood, fruit and vegetable etc).

Industry Grade: Mordant of printing and dyeing; Dechlorinate of textile after bleaching; Sulphonated agent and reducer of chemical industry and pharmacy; Bleach of paper pulp, bamboo and timber bleach of Stap; Treatment agent of waste water; Rubber solidifying agent Perfume industry is served as hydro carbon perfume aldehyde.