19 CFR 12.118 : Customs Duties (§ 0.1 To Parts 400-599) — (§ 0.1 To Parts 135-140) — U.S. Customs And Border Protection, Department Of Homeland Security; Department Of The Treasury (§ 0.1 To Parts 135-140) — Special Classes Of Merchandise (§ 12.1 To § 12.152) — Chemical Substances In Bulk And As Part Of Mixtures And Articles (§ 12.118 To § 12.127) — Toxic Substances Control Act.

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”).