Phenanthroline from Mexico
1,10-Phenanthroline is a tridentate heterocyclic ligand forming colored complexes with metal ions, used in analytical chemistry. Falls under HTS 2934.99.90.01 as other heterocyclic nitrogen compounds.
Duty Rate — Mexico → United States
110%
Rate breakdown
9903.04.6093.5%Except as provided in heading 9903.04.61, patented pharmaceutical articles as provided for in subdivisions (c) and (d) of U.S. note 40 to this subchapter
9903.05.5510%Except for products described in headings 9903.05.85–9903.05.92 and 9903.05.94, articles the product of Mexico, as provided for in U.S. note 52 to this subchapter
Import Tips
• Specify chelation capacity in technical data sheet for lab reagent verification
• Use child-resistant packaging if >1% concentration per CPSC rules
• Test for heavy metal impurities which affect complex formation purity