The term "waste polyurethane" here refers to polyurethane and its products that have lost their original functionality due to aging, breakage, performance degradation, or technological obsolescence during the production, use, and distribution of polyurethane products such as foams, coatings, adhesives, elastomers, and composites, or although not entirely losing utility value, have been discarded. After collection, crushing, sorting, and chemical or thermal processing, such waste polyurethane can be reutilized as resources, for example, recycled polyols, fuel, or filler materials for construction.