Sulfuric Acid Oleum from Mexico
Oleum, or fuming sulfuric acid (H2SO4 + SO3), is a highly corrosive liquid used in sulfonation processes. It falls under HTS 2811.19.61 as an other inorganic acid of nonmetals, distinct from standard sulfuric acid in 2807. This classification applies to its concentrated, oxygen-rich form per Chapter 28.
Duty Rate — Mexico → United States
14.2%
Rate breakdown
9903.05.5510%Section 301 (forced labor) — additional 10% ad valorem on products of Mexico
Import Tips
• Use glass-lined or PTFE-lined containers to prevent reaction during shipping
• Declare exact SO3 content for correct subheading; >20% shifts classification
• Comply with TSCA import certification for new chemical substances