过硫酸铵是一种白色晶体，分子式为(NH₄)₂S₂O₈，具有强氧化性和腐蚀性，易溶于水，在温水中溶解度增大，在水溶液中能水解成硫酸氢铵和过氧化氢。其干品具有良好的稳定性。加热至120°C会分解，潮湿空气中易受潮结块。主要用作氧化剂和制备过氧化氢、过硫酸钾和其它过硫酸盐。它可作高分子聚合反应游离引发剂，特别是氯乙烯化合物聚合中的乳化聚合和氧化还原聚合。油脂、肥皂业用作漂白剂。用于制备苯胺染料以及染料的氧化和电镀工业、照相业和化学分析中。食品级用作小麦改质剂、啤酒酵母防霉剂。还可作金属的蚀刻剂。贮存于通风、干燥的库房中，禁与易燃、还原性和有机物混贮混运。

Ammonium persulfate (APS) is the inorganic compound with the formula (NH₄)₂S₂O₈. It is a colourless (white) salt that is highly soluble in water, much more so than the related potassium salt. It is a strong oxidizing agent that is used in polymer chemistry, as an etchant, and as a cleaning and bleaching agent.