DuPont™ AmberLyst™ A26 OH Polymeric Catalyst is a Type I strong base anion, macroporous, polymeric catalyst based on crosslinked styrene-divinylbenzene copolymer containing quaternary ammonium groups. Its porous structure makes it a good choice for use in aqueous and non-aqueous media. The macroporous structure and pore size distribution imparts excellent resistance to mechanical and osmotic shock.