# Hydrogen — Gas group, temperature class and autoignition temperature by substance

For Hydrogen, classification system is IEC / ATEX; apparatus / gas group is IIC; temperature class is T1; ignition temperature (c) is 560, recorded from its source on 2026-08-06.

- **Substance:** Hydrogen _(verified: appears in the quote below)_
- **Classification system:** IEC / ATEX _(our reading, not quoted from the source)_
- **Apparatus / gas group:** IIC
- **Temperature class:** T1 _(verified: appears in the quote below)_
- **Ignition temperature (C):** 560 _(verified: appears in the quote below)_

## What the source says

> Hydrogen, which has an auto-ignition temperature of 560° C, will be classified in the T1 temperature class.

## Source

- https://www.cortemgroup.com/en/news/the-zones-of-the-plant-the-groups-and-the-temperature-classes-of-gases

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/).