Section 05 MINERAL PRODUCTS 26 Ores, slag and ash 26 21 Othe slag and ash, including seaweed ash (kelp); ash and residues from the in.ci 26 21 10 26 21 10 00 Commodity Code Description 26 21 10 00 00 - Ash and residues from the incineration of municipal waste 26 21 90 00 00 - Other