Tetramethylammonium Hydroxide (TMAH) 25% Solution from Mexico
Tetramethylammonium hydroxide is a quaternary ammonium hydroxide used as a developer in semiconductor manufacturing and as a strong organic base. The 25% aqueous solution is classified under HTS 2923.90.0100 per Chapter 29 notes covering quaternary ammonium hydroxides and water-dissolved forms. It remains a separate chemically defined compound.
Duty Rate — Mexico → United States
16.2%
Rate breakdown
9903.05.5510%Section 301 (forced labor) — additional 10% ad valorem on products of Mexico
Import Tips
• Classify based on principal function; provide end-use statements if for electronics to avoid industrial chemical mix-ups
• Corrosive nature requires proper UN numbering and packaging declarations under DOT regulations