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

For Methyl isocyanate, cas no. is 624-83-9; cercla rq (lbs) is 10; rcra waste number is P064; regulatory categories is 3,4, verified against its source on 2026-08-05.

- **Substance:** Methyl isocyanate _(verified: appears in the quote below)_
- **CAS No.:** 624-83-9 _(verified: appears in the quote below)_
- **CERCLA RQ (lbs):** 10 _(verified: appears in the quote below)_
- **RCRA waste number:** P064 _(verified: appears in the quote below)_
- **Regulatory categories:** 3,4 _(verified: appears in the quote below)_
- **EPCRA TPQ (lbs):** 500 _(per ecfr.gov, not stated by the source above)_
- **EPCRA RQ (lbs):** 10 _(per ecfr.gov, not stated by the source above)_

## What the source says

> Methyl isocyanate | 624-83-9 | 3,4 | P064 | 10 (4.54)

## What ecfr.gov says

> 10 | 500 | 624-83-9 | Methyl Isocyanate |

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

## Source

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

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/).