Waste absorbents, filter materials, wiping cloths, and protective clothing covered by Chapter 15 02 of the List of Wastes. Materials contaminated by dangerous substances are hazardous (15 02 02*), while uncontaminated materials are non-hazardous (15 02 03), forming a mirror pair. Classification depends on what substances the materials absorbed or filtered. Common examples include oil-soaked rags, spent filters, contaminated PPE, and spill cleanup materials.