# Ethylene oxide — Gas group, temperature class and autoignition temperature by substance

For Ethylene oxide, classification system is IEC / ATEX; apparatus / gas group is IIB, recorded from its source on 2026-08-06.

- **Substance:** Ethylene oxide _(verified: appears in the quote below)_
- **Classification system:** IEC / ATEX _(our reading, not quoted from the source)_
- **Apparatus / gas group:** IIB _(verified: appears in the quote below)_

## What the source says

> IIB | 0.50–0.90 | 0.45–0.80 | Ethylene, hydrogen sulphide, diethyl ether, ethylene oxide, town gas

## Source

- https://exknowledge.com/pages/gas-groups.html

Last verified: 2026-08-06. Review by: 2028-08-05.
Part of [Gas group, temperature class and autoignition temperature by substance](https://referencesource.org/hazardous-area-substance-classification/).