DuPont™ AmberLyst™ 46 Polymeric Catalyst is a macroporous, sulfonic acid polymeric catalyst designed primarily for use as a solid acid catalyst in esterification and transesterification reactions. Compared to conventional strongly acidic resin catalysts, AmberLyst™ 46 provides excellent selectivity in esterification reactions, suppressing by-product formation such as ethers or olefins while maintaining a high activity.