Number-average molecular weight

Number-average molecular weight means the arithmetic average of the molecular weight of all molecules in a polymer.


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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