Sodium metabisulfite  CAS No.        7681-57-4
 

(1)Molecular formula: Na2S2O5 

(2) Physical appearance: White Free Flowing Fine Crystal or Powder 

(3)Purity(Na2S2O5): 96% min Industry Grade 

(4)Content of SO2: 65% 

(5)Main use: 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 The hide profession employ to do to molt dose and pliable dose and wearproof dose; Sewage treatment, and so on. 

(6) Packing: Plastic woven bag internal with paper 

(7)Net weight: 25kg /bag 

(8)specification: 
Main content (Na2s2o5) min  96.5%; 
SO2 min 65.1% 
Content of iron (Fe) min0.005% 
Heavy metal( in pb) max 0.001% 
Content of arsenic(As) max 0.0002% 
PH: 4.3