Fumed Silica (Aerosil) from Mexico
Fumed silica, also known as pyrogenic silica, is an ultra-fine, non-porous silicon dioxide produced by flame hydrolysis of silicon tetrachloride. Classified under HTS 2811.22.5000 as 'other' silicon dioxide due to its synthetic chemical definition and high purity.
Duty Rate — Mexico → United States
10%
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
• Provide production process documentation (flame hydrolysis) to distinguish from precipitated types and avoid 3824 mixtures
• Declare surface area (BET, typically 50-400 m²/g) and aggregate structure to support chemical compound status