This document specifies the requirements, test methods, inspection rules, marking, packaging, transportation and storage of by-product ammonium sulfate. This document is applicable to the by-product ammonium sulfate produced during the production of diacetone acrylamide using acetone and acrylonitrile as raw materials, concentrated sulfuric acid as catalyst, o-xylene as solvent, and ammonia as neutralizing agent, for use in chemical production.