Formula: C8H7NaO3SN.W.: 206.19Item Specification Testing resultAppearance: free flowing powder passColor (as 1%APHA): 50 max 15Filterable material: 0.06%max 0.01%Halides (As NaCl): 6%Max 1.4%Iron: 0.0015%max 0.0002%Light absorbance/cm at 600nm: 0.035%max 0.011%PH (10% aqueous solution): 7.5-11 9.5Sodium sulfate: 0.8%max 0.18%Vinyl activity (as sss): 89%~100% 93.2%Water: 8%-12% 10.2%