Colloidal Silica Dispersion (50% Solids) from Germany
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 — Germany → United States
10%
Rate breakdown
9903.05.3910%Section 301 (forced labor) — European Union member state (col1 rate < 10 percent): MFN < 10% → total duty capped at 10%
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