Physical hazard · Oxidising gases
H270 — May cause or intensify fire; oxidiser
Physical hazard statements describe what the substance itself can do — explode, ignite, react, corrode metal. 5 substances with a harmonised EU classification carry this code.
01 · Wording
What H270 says
May cause or intensify fire; oxidiser.
CLP Annex III · Physical hazards
Oxidising gases GHS chapter 2.4
Category 1 · pictogram GHS03 (flame over circle) · signal word Danger
Unchanged since 2009.
Present in every UN GHS edition from Rev.3 (2009) to Rev.11 (2025), with the same wording throughout.
Nine editions of the UN model text, 86 hazard statements, 19 of which ever moved. Read the full story in what changed in UN GHS Rev.11.
02 · Legal status
Where H270 is current
GHS is a United Nations model text, revised every two years, and each jurisdiction adopts a revision on its own timetable. A code can be legally current in one system and deleted in another — that is normal, not an error.
| Jurisdiction | Basis | Status of H270 |
|---|---|---|
| EU CLP | Regulation (EC) 1272/2008 CLP Annex IV, Part 2 (consolidated) | Current |
| US OSHA HazCom | 29 CFR 1910.1200 Appendix C UN GHS Rev.7 (final rule of 20 May 2024) | Current |
| US HazCom 2012 | legacy · GHS Rev.3 UN GHS Rev.3, Annex 3 | Current |
| UN GHS | Rev.11 (2025) UN GHS Rev.11, Annex 3 | Current |
Currently in force under: EU CLP, US OSHA HazCom, US HazCom 2012, UN GHS. Sources: EU CLP · US OSHA HazCom · US HazCom 2012 · UN GHS
03 · Substances
Substances carrying H270
Every entry whose harmonised CLP Annex VI classification includes this hazard statement. Substances with a reference page here open on this site; the rest open on ghssymbols.com.
- chlorine CAS 7782-50-5
- chlorine dioxide CAS 10049-04-4
- fluorine CAS 7782-41-4
- nitrogen dioxide [1]; dinitrogen tetraoxide [2] CAS 10102-44-0[1]10544-7
- oxygen CAS 7782-44-7
Nothing matches that filter.
All hazard statements
The full list of H-codes with the jurisdiction switch lives on the hazard statements hub. For what to do about the hazard, see precautionary statements (P-codes).
Wording quoted from the regulation named above. Substance counts come from harmonised classifications in CLP Annex VI — the statements on a real product also depend on the supplier's own classification. Always check the supplier safety data sheet.