Propertise Use
 
　　This reagent,for colorless crystallization(commonly called as the sodium thiosultate),dissolve it in the water,does not disslove in the ethanol,used as the reducing agent,fixer,dechlorinate the pharmaceutical,disinfectant and antioxidant.etc
 
Physicalproperfies
 
Formula 　　　Na2S2O3.5H2O
Weight 　　　　248.17
Density　　1.729(25。C)
point　　　40-45。C　
48。C begin to resolve, 100。C lose all water of crystallization and become the anhydrous thing
 

Specification
(GB637-88)
 
NAME (%) (%) (%)
　　Na2S2O3.5H2O 99.5 99.0 98.5
　　PH 6.0-7.5 6.0-7.5 6.0-7.5
　　Putty degree and test Qualified Qualified Qualified
　　Water insoluble matter 0.002 0.005 0.01
　　(Cl) 0.02 0.02 ---
　　(SO4) 0.04 0.05 0.1
　　(S) 0.0001 0.00025 0.0005
　　(N) 0.002 0.005 ---
　　(K) 0.01 --- ---
　　(Mg) 0.001 0.001 ---
　　(Ca) 0.003 0.003 0.005
　　(Fe) 0.0005 0.0005 0.001
　　(Pb) 0.0005 0.0005 0.001
 

Package and storage
 
   
  ※ 25kg/in bag　　500g/bottle
  ※ it should be stored in cool and centilated place and kept away from sunlight and rain.