Dimer acid from Mexico
Dimer acids are oligomeric cyclanic polycarboxylic acids produced by clay-catalyzed dimerization of unsaturated fatty acids. Despite polymer nature, classified as chemically defined cyclanic polycarboxylic acids under HTS 2917.20.00.00 when meeting purity standards. Used in polyamide hot-melt adhesives.
Duty Rate — Mexico → United States
14.2%
Rate breakdown
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
• Submit GPC analysis showing number-average MW <1000 Da to qualify as Chapter 29 compound
• Provide acid value and saponification value test results confirming polycarboxylic nature
• Distinguish from trimer acids which may require different statistical reporting