High-Purity Polyphosphoric Acid for Semiconductor Etching from Mexico
Ultra-pure polyphosphoric acid (99%+), free of metallic impurities, used in microelectronics for wafer etching and doping. Falls under HTS 2809.20.00.40 as a chemically defined polyphosphoric acid per Chapter 28 notes.
Duty Rate — Mexico → United States
10%
Rate breakdown
9903.05.5510%Section 301 (forced labor) — additional 10% ad valorem on products of Mexico
Import Tips
• Submit impurity analysis (<1 ppm metals) to justify 'chemically defined' status
• Use cleanroom-compatible packaging; declare as high-tech material for possible duty relief
• Comply with ITAR/EAR if destined for semiconductor defense applications