Refined High Acid Number Naphthenic Acid from Mexico
Distilled naphthenic acid with acid number 200-250 mg KOH/g, used in metalworking fluids and rubber additives. Falls under HTS 3824.99.7510 as their water-insoluble salts are separately classified. Key for emulsifiers in oil-based formulations.
Duty Rate — Mexico → United States
13.7%
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
• Test and certify acid number via titration; provide neutralization value on commercial invoice
• Ensure DOT hazardous material classification for corrosive liquids
• Watch for reclassification if metal salts present