Tetraethylorthosilicate from Mexico
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 — Mexico → United States
13.7%
Rate breakdown
9903.05.5510%Section 301 (forced labor) — additional 10% ad valorem on products of Mexico
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