9901.00.52 - Ethyl tertiary-butyl ether (provided for in subheading 2909.19.18) and any mixture containing ethyl tertiary-butyl ether

This HTS category, 9901.00.52, specifically covers Ethyl tertiary-butyl ether (ETBE) and any mixtures containing ETBE. This classification is a temporary modification under Chapter 99 of the Harmonized Tariff Schedule, indicating special or restricted treatment, often related to agricultural import restrictions under Section 22 of the Agricultural Adjustment Act. The reference to subheading 2909.19.18 signifies that ETBE, in its pure or primary form, would ordinarily fall under the chemical classification for cyclic ethers.

Unlike the numerous primary goods found in the earlier chapters of the HTS, such as live animals (Chapters 01) or various agricultural and manufactured products, this category is dedicated to a specific chemical compound and its formulations. Its placement within Chapter 99 highlights its unique regulatory status, distinct from standard commodity classifications. The purpose of this specific subheading is to impose or modify import rules on ETBE and related mixtures, likely due to their impact on agricultural markets or policy objectives.

As this is a leaf node in the HTS database, there are no further subdivisions. Classification under 9901.00.52 is definitive for ETBE and any product where ETBE is a component. Importers must verify the presence of ETBE to determine if their goods fall under this specific temporary provision, rather than the general chemical classification of ethers.