Section 06 Products of the chemical or allied industries 38 Miscellaneous chemical products 38 25 Residual products of the chemical or allied industries, not elsewhere specified or included; municipal waste; sewage sludge; other wastes specified in Note 6 to this Chapter. 38 25 20 Sewage sludge 38 25 20 00 Sewage sludge Commodity Code Description 38 25 20 00 000 Sewage sludge