DuPont™ AmberLyst™ 16WET Polymeric Catalyst is a bead-form, macroporous, sulfonic acid catalyst developed particularly for heterogeneous catalysis. The macroporous structure and large pore diameter of AmberLyst™ 16WET provides excellent activity in polar organic systems and a good resistance against polymer fouling. AmberLyst™ 16WET is mainly used in esterification and phenol alkylation reactions.