... industry, chemical industry, metallurgy, printing and dyeing, synthetic detergent etc2 soda ash dense: Materials of glass industry, chemical industry, metallurgy, printing and dyeing ... .03Loss in ignition % ≤0.811.30.5Soda ash dense GB210-92ItemHigh-classExportTotal alkalinity (as Na2Co3) % ≥99.299.5Chloride (as NaCl) % ≤0.50.3Iron ...