Stabilized Methylphosphonic Acid Flakes from Mexico
Methylphosphonic acid flakes with minimal stabilizer for safe transport, falling under HTS 2931.44.00.00 per Chapter 29 note (f) allowing added stabilizers. Used in polymer flame retardant production.
Duty Rate — Mexico → United States
13.7%
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
• Document stabilizer as necessary for preservation only; test for anti-caking agents
• Pitfall: excessive additives trigger note (g) but risk specific use exclusion