BPA is classified under subheading 290723. Importers should verify whether any antidumping or countervailing duty orders are in effect for the specific country of origin at the time of entry, as chemical intermediates like BPA have historically been subject to such measures.

Monophenols contain a single hydroxyl group on the aromatic ring and are classified under the 290711–290719 subheadings. Polyphenols carry two or more hydroxyl groups on one or more rings; those not specifically named fall under 290729. The number and position of hydroxyl groups, confirmed by the chemical specification, determines which subheading applies.