... price &Good service 4.Prompt delivery Specification of the Anhydrous Sodium Sulfite1,Molecular formula : Na2SO32,Molecular weight : 126.043, ... -2003Index name Premium grade Super gradeFirst gradeSalable productIndustrial gradeSodium sulfite ( Na2SO3 ) , % ≥97.096.093.090.0Fe , ?≤0.0030 ... /Water insoluble matter , % ≤0.020.030.05/Free Alkali ( as Na2SO3 ) , % ≤0.100.400.60/Na2SO4 , % ≤1.10///NaCl , ...