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
9903.05.5510%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
• 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