# Cyanogen Bromide — US federal chemical regulatory reporting thresholds by program (CERCLA, EPCRA, CAA)

For Cyanogen Bromide, cas no. is 506-68-3; epcra tpq (lbs) is 500/10,000; epcra rq (lbs) is 1,000, verified against its source on 2026-08-05.

- **Substance:** Cyanogen Bromide _(verified: appears in the quote below)_
- **CAS No.:** 506-68-3 _(verified: appears in the quote below)_
- **EPCRA TPQ (lbs):** 500/10,000 _(verified: appears in the quote below)_
- **EPCRA RQ (lbs):** 1,000 _(verified: appears in the quote below)_
- **CERCLA RQ (lbs):** 1000 _(per ecfr.gov, not stated by the source above)_
- **RCRA waste number:** U246 _(per ecfr.gov, not stated by the source above)_
- **Regulatory categories:** 4 _(per ecfr.gov, not stated by the source above)_

## What the source says

> 1,000 | 506-68-3 | Cyanogen Bromide | | 1,000 | 500/10,000 |

## What ecfr.gov says

> Cyanogen bromide (CN)Br | 506-68-3 | 4 | U246 | 1000 (454)

Source: https://www.ecfr.gov/current/title-40/chapter-I/subchapter-J/part-302/section-302.4

## Source

- https://www.ecfr.gov/current/title-40/chapter-I/subchapter-J/part-355
- https://www.ecfr.gov/current/title-40/chapter-I/subchapter-J/part-302/section-302.4

Last verified: 2026-08-05. Review by: 2027-08-05.
Part of [US federal chemical regulatory reporting thresholds by program (CERCLA, EPCRA, CAA)](https://referencesource.org/chemical-regulatory-reporting-thresholds/).