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      Anhydrous sodium sulfate
      Anhydrous sodium sulfate ( glaubers salt ) standard (GB6009-2003)

      Item
      Value
       
       
       
       
       
        1
       
      2
       
      3
       
       
      Premium grade
      First grade
      Premium grade
      First grade
      Premium grade
      First grade
      Na2SO4 / % ≥
      99.3
      99.0
      98.0
      97.0
      95.0
      92.0
      Water insoluble matter % ≤
      0.05
      0.05
      0.10
      0.20
      -
      -
      Ca Nad Mg (as Mg ) % ≤
      0.10
      0.15
      0.30
      0.40
      0.60
      -
      Oxide (as Cl ) % ≤
      0.12
      0.35
      0.70
      0.90
      2.0
      -
      Fe (as Fe ) % ≤
      0.002
      0.002
      0.010
      0.040
      -
      -
      Moisture % ≤
      0.10
      0.20
      0.50
      1.0
      1.5
      -
      Whiteness(R457) % ≥
      85
      82
      82
      -
      -
      -
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