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45%potassium sulfite
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Sodium metabisulfite

Synonyms:  Sodium metabisulphite; Sodium metabisulfite; Sodium disulfite; Sodium disulphite; Sodium pyrosulfite;  
                       Sodium pyrosulphite  
Molecular formula: Na2S2O5
Molecular weight: 190.10
CAS No.: 7681-57-4        EINECS No.: 231-673-0         H.S.Code: 28321000
Properties: White or yellow crystalline powder or crystal with strong sulphur dioxide smell, specific gravity: 1.4,  soluble in water, glycerine and little in ethanol , aqueous solution  is acidic fluid. 

TECH GRADE  /  FOOD GRADE

Item

Specifications

Tech  Grade Food grade FCC

     Purity    [ Na2S2O5 ]                             % ≥

96.0

97.0

         90.0 - 100.5

     Sulphur dioxideSO2 ]                        % ≥

65.0

65.3

 

     Clarity  confirm confirm  
     Iron content Fe ]                                 % ≤ 0.005 0.003               0.001
     Heavy metal [ as per Pb ]                     % ≤ 0.001 0.001  
     Arsenic [ As ]                                      % ≤ 0.0002 0.0002  

     Water insoluble matter,                        % ≤

0.02

0.02

 
     PH   4.0 - 4.6 4.0 - 4.6  
  Lead(Pb)     mg/kg                                      ≤                         2

   Selenium(Se) mg/kg                                  ≤         

 

 

5

Application: Mainly used in pharmaceutic materials, paper industry, photochem, bleaching, developer, leather chroming agent, rubber industry, dyes, printing dyeing, textile auxiliary, cotton wool, antichlor, chromate waste water treatment agent, anticorrosive, disinfecting etc..

.Packing: In plastic woven bags / kraft paper bags / LDPE bags of 25 kgs net and PE bags lining,  or in 1,000 / 1,100 kgs big bags.  or in 1 kg Aluminium foil bags / 2.5 kgs bottles. 

Transportation & storage: It can not be exposured in open air or under the sunlightmust be stored under ventilating, drying,  never mix stored with gasoline, acids, oxidants and other inflammable substances etc. 

   
   

 

 
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