Stabilized Maleic Acid for Transport from Mexico
Maleic acid with added polymerization inhibitor (hydroquinone 50-200 ppm) per Chapter 29 note (f) for safe transport, classified under HTS 2917.19.23.00. Stabilizer prevents exothermic polymerization during shipping. Used in unsaturated polyester resin manufacturing.
Duty Rate — Mexico → United States
16.5%
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 Material Safety Data Sheet (MSDS) specifying stabilizer type and concentration to qualify under Chapter 29 note (f)
• Ship at 10-40°C temperature range; provide temperature recorder data for insurance claims
• Test inhibitor levels upon Customs clearance as depletion may trigger reclassification