Section 05 Mineral products 26 Ores, slag and ash 26 21 Other slag and ash, including seaweed ash (kelp); ash and residues from the incineration of municipal waste 26 21 10 - Ash and residues from the incineration of municipal waste 26 21 10 00 - Ash and residues from the incineration of municipal waste Commodity Code Description 26 21 10 00 000 - Ash and residues from the incineration of municipal waste