Colloidal Silica Concrete Densifier from Canada
Nano-particle suspension of amorphous silica in water used to chemically densify concrete by filling capillary pores and reacting with calcium hydroxide. Wholly inorganic, qualifies for HTS 3824.40.20.00 as prepared concrete additive. Increases durability by 40-50%.
Duty Rate — Canada → United States
10%
Rate breakdown
9903.05.2910%Except for products described in headings 9903.05.85–9903.05.93, articles the product of Canada, as provided for in U.S. note 52 to this subchapter
Import Tips
• Particle size distribution certificate needed; shelf life and stability data; avoid classification as precipitated silica