Polymer means a chemical substance consisting of molecules characterized by the sequence of one or more types of monomer units and comprising a simple weight majority of molecules containing at least 3 monomer units which are covalently bound to at least one other monomer unit or other reactant and which consists of less than a simple weight majority of molecules of the same molecular weight. Such molecules must be distributed over a range of molecular weights wherein differences in the molecular weight are primarily attributable to differences in the number of monomer units. In the context of this definition, sequence means that the monomer units under consideration are covalently bound to one another and form a continuous string within the molecule, uninterrupted by units other than monomer units.


40 CFR § 723.250

Scoping language

Purpose and scope.
(1) This section grants an exemption from certain of the premanufacture notice requirements of section 5(a)(1)(A) of the Toxic Substances Control Act (15 U.S.C. 2604(a)(1)(A)) for the manufacture of certain polymers. This section does not apply to microorganisms subject to part 725 of this chapter.
(2) To manufacture a new chemical substance under the terms of this section, a manufacturer must:
(i) Determine that the substance meets the definition of polymer in paragraph (b) of this section.
(ii) Determine that the substance is not specifically excluded by paragraph (d) of this section.
(iii) Ensure that the substance meets the exemption criteria of paragraph (e) of this section.
(iv) Submit a report as required under paragraph (f) of this section.
(v) Comply with the recordkeeping requirements of paragraph (j) of this section.

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