# Hydrogen sulphide · IEC / ATEX · 270 — Gas group, temperature class and autoignition temperature by substance

For Hydrogen sulphide, classification system is IEC / ATEX; ignition temperature (c) is 270; apparatus / gas group is IIB; temperature class is T3, recorded from its source on 2026-10-06.

- **Substance:** Hydrogen sulphide _(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)_
- **Temperature class:** T3 _(verified: appears in the quote below)_
- **Ignition temperature (C):** 270 _(verified: appears in the quote below)_

## What the source says

**Apparatus / gas group:** The source prints this value inside the passage below but does not name it there. The passage shows where it appears; what ties it to this record is the position on the page, not anything the passage says.

> Hydrogen sulphide H2S 270 T3 IIB

## Related records

- [Di-ethyl ether · IEC / ATEX · 160](https://referencesource.org/hazardous-area-substance-classification/160-iec-atex-di-ethyl-ether/)
- [Diethyl ether · IEC / ATEX](https://referencesource.org/hazardous-area-substance-classification/iec-atex-diethyl-ether/)
- [Ethylene · IEC / ATEX · 450](https://referencesource.org/hazardous-area-substance-classification/450-iec-atex-ethylene/)
- [Ethylene · IEC / ATEX · 490](https://referencesource.org/hazardous-area-substance-classification/490-iec-atex-ethylene/)
- [Ethylene · IEC / ATEX](https://referencesource.org/hazardous-area-substance-classification/iec-atex-ethylene/)
- [Ethylene oxide · IEC / ATEX](https://referencesource.org/hazardous-area-substance-classification/iec-atex-ethylene-oxide/)
- [Hydrogen sulphide · IEC / ATEX](https://referencesource.org/hazardous-area-substance-classification/iec-atex-hydrogen-sulphide/)
- [Methyl ethyl ketone (MEK) · IEC / ATEX · 505](https://referencesource.org/hazardous-area-substance-classification/505-iec-atex-methyl-ethyl-ketone-mek/)
- [Propan-1-ol (n-propyl alcohol) · IEC / ATEX · 371](https://referencesource.org/hazardous-area-substance-classification/371-iec-atex-propan-1-ol-n-propyl-alcohol/)
- [Town gas · IEC / ATEX](https://referencesource.org/hazardous-area-substance-classification/iec-atex-town-gas/)

## Source

- https://greenishco.com/Downloads/ATEX.pdf

Last verified: 2026-10-06. Review by: 2028-10-05.
Part of [Gas group, temperature class and autoignition temperature by substance](https://referencesource.org/hazardous-area-substance-classification/).