Dibenzothiophene from Mexico
Dibenzothiophene is a tricyclic aromatic compound with a sulphur heterocycle fused between two benzene rings. It is a common pollutant found in petroleum fractions and is studied for desulphurization processes. As a separate chemically defined organo-sulphur compound with sulphur directly linked to aromatic carbons, it falls under heading 29.30 and tariff item 2930.90.00.
Duty Rate — Mexico → Canada
0%
Import Tips
• Although dibenzothiophene contains a heterocyclic ring, Chapter 29 Note 7 excludes only specific ring structures; this compound remains in heading 29.30
• Provide the melting point and purity certificate for customs clearance
• Check if the product requires environmental permits due to its classification as a pollutant