---
kind: "section"
citation: "40 C.F.R. § 791.3"
title: "40"
number: "791.3"
heading: "Definitions."
url: "https://uscodex.org/cfr/40/791.3"
---

# §791.3. Definitions.


Terms defined in the Act, and not explicitly defined herein, are used with the meanings given in the Act.

- (a) **The Act—** refers to the Toxic Substances Control Act (TSCA) ([15 U.S.C. 2601](/usc/15/2601.md) et seq.).
- (b) **The Agency—** or EPA refers to the Environmental Protection Agency.
- (c) **Byproduct—** refers to a chemical substance produced without a separate commercial intent during the manufacture, processing, use or disposal of another chemical substance or mixture.
- (d) **Dispute—** refers to a present controversy between parties subject to a test rule over the amount or method of reimbursement for the cost of developing health and environmental data on the test chemical.
- (e) **Exemption holder—** refers to a manufacturer or processor, subject to a test rule, that has received an exemption under sections [4(c)(1)](/cfr/40/4.md?p=c-1) or [4(c)(2)](/cfr/40/4.md?p=c-2) of TSCA from the requirement to conduct a test and submit data.
- (f) **Impurity—** refers to a chemical substance unintentionally present with another chemical substance or mixture.
- (g) **A <I>party</I> refers to a person subject to a section 4 test rule, who—**
  - (1) Seeks reimbursement from another person under these rules, or
  - (2) **From whom reimbursement is sought under these rules.**
- (h) **Reimbursement period—** refers to a period that begins when the data from the last non-duplicative test to be completed under a test rule is submitted to EPA and ends after an amount of time equal to that which had been required to develop that data or after 5 years, whichever is later.
- (i) **Small business—** refers to a manufacturer or importer whose annual sales, when combined with those of its parent company (if any) are less than $30 million.
- (j) **Test rule—** refers to a regulation ordering the development of data on health or environmental effects or chemical fate for a chemical substance or mixture pursuant to TSCA [section 4(a)](/cfr/40/4.md?p=a).

## Notes

### Authority

Authority: 15 U.S.C. 2603 and 2607.

### Source

Source: 48 FR 31791, July 11, 1983, unless otherwise noted.