Aluminium Sulphate 17/18%, solid
Aluminium sulphate Al2(SO4)3 • 18 H2O (technically usually 14–15 H2O) is next to oxide the most commonly used aluminium compound. It is technically produced by the reaction of pure aluminium hydroxide with concentrated sulphuric acid.
2 Al(OH)3 + 3 H2SO4 --> Al2(SO4)3 + 6 H2O
In anhydrous condition aluminium sulphate is a white powder. Hydrated, it forms colourless, acicular, sour-tasting crystals. Aluminium sulphate dissociates in water to form a colloidal solution of aluminium hydroxide molecules and positively charged aluminium hydroxide ions (Al (OH)2+, Al (OH)2+):
Al2(SO4)3 + 6 H2O --> 2 Al(OH)3 + 3 SO42- + 6 H+
Through this process, such aqueous solutions are reacting strongly acidic. The hydroxide formation comes – after the achievement of equilibrium – to a halt, so that the solution also contains some free Al3+ ions. The cationic activity of aluminium sulphate solutions is dissolved by the positively charged aluminium hydroxide ions, which are aggregated with the aluminium hydroxide molecules. Therefore you have a positive zeta potential.
Through high quality raw materials, decades of experience which has optimised the production process as well as regular quality controls, the standard product meets the stringent requirements for drinking water treatment chemicals (DIN EN 878, type 1, iron-free).
Solid aluminium sulphate is also available in pharmaceutical grade in accordance with Ph.Eur., BP and USP as well as in food quality in accordance with the provisions of the Regulation on requirements for additives and marketing of additives for technological purposes (ZVerkV) in conjunction with the EC Directive 2008/84/EC.
For health and safety information, please see our Safety Data Sheets.
The above data is not binding and represents the current state of knowledge. A legally binding assurance of certain properties cannot be derived. Proprietary rights and existing laws and regulations should be followed by the recipient of our products on their own responsibility.