Tetraethylorthosilicate from China
Tetraethylorthosilicate (Si(OC2H5)4), also known as TEOS, is an organo-silicon compound used in sol-gel processes and chemical vapor deposition. It falls under HTS 2931.90.90.10 as a separate chemically defined organo-inorganic compound with silicon-carbon/oxygen linkages.
Duty Rate — China → United States
28.7%
Rate breakdown
9903.88.0425%Except as provided in headings 9903.88.33, 9903.88.34, 9903.88.36, 9903.88.37, 9903.88.38, 9903.88.40, 9903.88.46, 9903.88.48, 9903.88.56, 9903.88.64, 9903.88.66, 9903.88.67, or 9903.88.69, articles the product of China, as provided for in U.S. note 20(g) to this subchapter and as provided for in the subheadings enumerated in U.S. note 20(g)
9903.03.030%Articles the product of any country, as provided for in subdivision (aa)(ii) of U.S. note 2 to this subchapter
Import Tips
• Include hydrolysis stability data; stabilizers must qualify under Chapter 29 note (f) to avoid reclassification
• Declare CAS 78-10-4 and provide flash point/moisture sensitivity info for proper hazmat handling