Mr. Joseph J. Chivini
Austin Chemical Company, Inc.
1565 Barclay Boulevard
Buffalo Grove, Illinois 60089

RE: The tariff classification of Tetraethoxysilane, CAS 78-10-4 from China and Germany

Dear Mr. Chivini:

In your letter dated April 23, 2007, you requested a tariff classification ruling.

Tetraethoxysilane, CAS 78-10-4, also known as Silicic acid (H4SiO4), tetraethyl ester, is an ester of silicic acid (a nonmetal inorganic acid) imported for use as a pharmaceutical intermediate.

The applicable subheading for Tetraethoxysilane will be 2920.90.5090, Harmonized Tariff Schedule of the United States (HTSUS), which provides for Esters of other inorganic acids of nonmetals (excluding esters of hydrogen halides) and their salts; their halogenated, sulfonated, nitrated or nitrosated derivatives: Other: Other: Other. The rate of duty will be 3.7 percent ad valorem.

Duty rates are provided for your convenience and are subject to change. The text of the most recent HTSUS and the accompanying duty rates are provided on World Wide Web at This ruling is being issued under the provisions of Part 177 of the Customs Regulations (19 C.F.R. 177).

A copy of the ruling or the control number indicated above should be provided with the entry documents filed at the time this merchandise is imported. If you have any questions regarding the ruling, contact National Import Specialist Stephanie Joseph at 646-733-3268.


Robert B. Swierupski
National Commodity
Specialist Division