# Ethylene Oxide — OSHA PSM vs EPA RMP: chemical threshold quantities side by side

For Ethylene Oxide, cas no. is 75-21-8; osha psm tq (lbs) is 5000, verified against its source on 2026-08-15.

- **Substance:** Ethylene Oxide _(verified: appears in the quote below)_
- **CAS No.:** 75-21-8 _(verified: appears in the quote below)_
- **OSHA PSM TQ (lbs):** 5000 _(verified: appears in the quote below)_
- **EPA RMP TQ (lbs):** 10,000 _(per ecfr.gov, not stated by the source above)_
- **RMP category:** toxic _(per ecfr.gov, not stated by the source above)_
- **RMP basis for listing:** a, b _(per ecfr.gov, not stated by the source above)_

## What the source says

> Ethylene Oxide | 75-21-8 | 5000

## What ecfr.gov says

> Ethylene oxide [Oxirane] | 75-21-8 | 10,000 | a, b

Source: https://www.ecfr.gov/current/title-40/chapter-I/subchapter-C/part-68/subpart-F/section-68.130

## Source

- https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.119AppA
- https://www.ecfr.gov/current/title-40/chapter-I/subchapter-C/part-68/subpart-F/section-68.130

Last verified: 2026-08-15. Review by: 2027-08-15.
Part of [OSHA PSM vs EPA RMP: chemical threshold quantities side by side](https://referencesource.org/psm-rmp-chemical-threshold-crossref/).