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
9903.03.0110%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
• 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