Polyethyleneimine finds many applications in products like: detergents, adhesives, water treatment agents and cosmetics.[9] Thanks to ability to modify the surface of cellulose fibres, PEI is employed as a wet-strength agent in the paper-making process.[10] It is also used as flocculating agent with silica sols and as a chelating agent with the ability to complex metal ions such as zinc and zirconium.[11] There are also other highly specialized PEI applications: