19 C.F.R. § 12.118 Toxic Substances Control Act.
Title 19 - Customs Duties
The importation into the customs territory of the United States of a chemical substance in bulk or as part of a mixture, or article containing a chemical substance or mixture, is governed by the Toxic Substances Control Act (“TSCA”) (15 U.S.C. 2601 et seq.), and by regulations issued under the authority of section 13(b), TSCA (15 U.S.C. 2612(b)) by the Secretary of the Treasury in consultation with the Administrator, Environmental Protection Agency (“EPA”).
Title 19: Customs Duties
PART 12—SPECIAL CLASSES OF MERCHANDISE
Chemical Substances in Bulk and as Part of Mixtures and Articles
§ 12.118 Toxic Substances Control Act.

