HTS code 2620.21.00 covers "Slag, ash and residues (other than from the manufacture of iron or steel), containing arsenic, metals or their compounds › Leaded gasoline sludges and leaded anti-knock compound sludges" under the US Harmonized Tariff Schedule. This is the official duty rate charged by US Customs when this product is imported into the United States, sourced directly from the U.S. International Trade Commission and refreshed daily.