---
kind: "section"
citation: "40 C.F.R. § 721.4140"
title: "40"
number: "721.4140"
heading: "Hexachloronorbornadiene."
url: "https://uscodex.org/cfr/40/721.4140"
---

# §721.4140. Hexachloronorbornadiene.

- (a) **Chemical substance and significant new uses subject to reporting.**
  - (1) The chemical substance 1,2,3,4,7,7-hexachloronorbornadiene, CAS Number 3389-71-7, is subject to reporting under this section for the significant new use described in [paragraph (a)(2)](#a-2) of this section.
  - (2) **The significant new use is—** Use other than as an intermediate in the production of isodrin or endrin.
- (b) **Specific requirements.** The provisions of subpart A of this part apply to this section except as modified by this paragraph.
  - (1) **Definitions.** In addition to the definitions in [§ 721.3](/cfr/40/721.3.md), the following definitions apply:
    - (i) “Endrin” means the pesticide 2,7:3,6-Dimethanonaphth[2,3-b]oxirene, 3,4,5,6,9,9-hexachloro-1a,2,2a,3,6,6a,7,7a-octahydro-, (1a alpha, 2beta,2abeta,3alpha,6alpha,6abeta, 7beta,7aalpha)-, CAS Number 72-20-8.
    - (ii) “Isodrin” means the pesticide 1,4:5,8-Dimethano-naphthalene,1,2,3,4,10,10-hexachloro-1,4,4a,5,8,8a-hexahydro-, (1alpha, 4alpha, 4abeta, 5beta, 8beta, 8abeta)-, CAS Number 465-73-6.
  - (2) [Reserved]

## Notes

### Amendments

[50 FR 47538, Nov. 19, 1985. Redesignated at 53 FR 2845, Feb. 2, 1988. Further redesignated at 58 FR 29946, May 24, 1993, as amended at 58 FR 34204, June 23, 1993]

### Authority

Authority: 15 U.S.C. 2604, 2607, and 2625(c).

### Source

Source: 49 FR 35018, Sept. 5, 1984, unless otherwise noted.

### Amendments

[50 FR 47538, Nov. 19, 1985. Redesignated at 53 FR 2845, Feb. 2, 1988. Further redesignated at 58 FR 29946, May 24, 1993, as amended at 58 FR 34204, June 23, 1993]