PAC :Polyaluminium Chloride . Chemical Formula: [AL2(OH)LnCL6-n]Color:yellow , lemon yellow powderCAS:1327-41-9Standard:GB15892-2003Index GradeDrinking Water Non-Drinking Water AL2O3 (%) 29-32 27-29 Basicity (%) 60-90 60-90 PH 3.5-5.0 3.5-5.0 Water-insoluble matters ≤0.5-1.5 ≤1.5-3.0 AS (%) ≤0.0005PB (%) ≤0.03CD (%) ≤0.0006FE (%) ≤0.0003