Silicic Acid Tetraethyl Ester (Tetraethoxysilane) from Germany
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 — Germany → United States
15%
Rate breakdown
9903.04.6211.3%Pharmaceuticals: patented pharma from JP/EU/KR/CH/LI — 15% floor rate
9903.05.900%Articles already subject to Section 232 (steel/aluminum/copper + derivatives, autos + parts, wood, medium/heavy vehicles + parts, semiconductors, patented pharma) — U.S. note 52(f)
Import Tips
• Hydrolysis rate data needed for sol-gel application declarations
• Silicon content verification prevents misclassification as organosilicon polymer