19 C.F.R. § 12.119

Sections 12.120 through 12.127 apply to the importation into the customs territory of the United States of:

(a) Chemical substances in bulk form and as part of a mixture under TSCA;

(b) TSCA-excluded chemicals; and

(c) Articles containing a chemical substance or mixture if so required by the Administrator by specific rule under TSCA.