Cetyltrimethylammonium Bromide (CTAB) from Mexico
CTAB is a quaternary ammonium cationic surfactant with an aromatic-modified structure, widely used in laboratory applications for DNA extraction and as an antimicrobial agent. It qualifies under heading 3402 as it produces stable emulsions and lowers surface tension per the chapter note test. The aromatic modification places it specifically in 3402.41.10.00.
Duty Rate — Mexico → United States
14%
Rate breakdown
9903.03.0110%Except for products described in headings 9903.03.02–9903.03.11, articles the product of any country, as provided for in subdivision (aa) of U.S. note 2 to this subchapter
Import Tips
• Include lab test results confirming 0.5% solution meets emulsion stability and surface tension criteria from heading 3402 note
• Label clearly as 'not for direct retail sale' to prevent misclassification as a washing preparation
• Watch for purity levels; technical grade >95% stays in 3402.41, diluted forms may go to 3402.90