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%Section 301 (forced labor) — additional 10% ad valorem on products of Canada
Import Tips
• Particle size distribution certificate needed; shelf life and stability data; avoid classification as precipitated silica