Silicic Acid Tetraethyl Ester (Tetraethoxysilane) from Canada
Tetraethyl orthosilicate (TEOS) is silicic acid tetraester used in sol-gel processing, chemical vapor deposition, and zeolite manufacturing. Classifies under HTS 2920.90.51.00 as ester of inorganic silicon acid. Semiconductor precursor.
Duty Rate — Canada → United States
13.7%
Rate breakdown
9903.05.2910%Section 301 (forced labor) — additional 10% ad valorem on products of Canada
Import Tips
• Hydrolysis rate data needed for sol-gel application declarations
• Silicon content verification prevents misclassification as organosilicon polymer