Colloidal Silica Dispersion (50% Solids) from Mexico
Colloidal silica is a stable suspension of amorphous silicon dioxide nanoparticles in water or solvent, used for chemical mechanical polishing in semiconductors. It qualifies under HTS 2811.22.5000 as silicon dioxide in a chemically defined colloidal form.
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
• Specify 'aqueous dispersion of silicon dioxide' on invoices; concentration >30% solids keeps it as the compound, not a mixture
• Include stability and pH data to prove it's a true colloidal solution under Chapter 28 definitions