Here, "waste acrylic glass" refers to acrylic glass (polymethyl methacrylate, PMMA) products that, in plastic products, architectural decoration, advertising display, optical devices and other applications, have lost their original function due to ageing, breakage, performance degradation or the end of their service life, or that, although not having entirely lost their value in use, have been discarded. After collection, sorting, cleaning, crushing and re-melting or chemical recycling, such waste acrylic glass can be reused as recycled PMMA feedstock for the production of sheets, profiles, optical or decorative products, achieving resource recovery.