Product quality meets the national standard GB15892-2020 Polyaluminum chloride is a water-soluble inorganic polymer made by hydrolytic polymerization of aluminium salts (such as aluminium trichloride, aluminium sulphate, alum, etc.) under certain conditions, with the chemical formula [Alâ??(OH)â??Clâ??â??â??]. â??. Appearance and Properties The solid presents as yellow, light yellow, brown, white and other colours of powder, granule; The aqueous solution shows different degrees of turbidity or transparency.