Physical hazard · Oxidising liquids
H271 — May cause fire or explosion; strong oxidiser
Physical hazard statements describe what the substance itself can do — explode, ignite, react, corrode metal. 15 substances with a harmonised EU classification carry this code.
01 · Wording
What H271 says
May cause fire or explosion; strong oxidiser.
CLP Annex III · Physical hazards
Oxidising liquids GHS chapter 2.13
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 H271 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 H271 |
|---|---|---|
| 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 H271
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.
- 1,3-dichloro-5-ethyl-5-methylimidazolidine-2,4-dione CAS 89415-87-2
- ammonium perchlorate; [containing ≥ 80 % of 0-30 µm particles] CAS 7790-98-9
- barium chlorate CAS 13477-00-4
- barium perchlorate CAS 13465-95-7
- chromium trioxide CAS 1333-82-0
- chromyl dichloride; chromic oxychloride CAS 14977-61-8
- dichromium tris(chromate); chromium III chromate; chromic chromate CAS 24613-89-6
- hydrogen peroxide CAS 7722-84-1
- perchloric acid ... % CAS 7601-90-3
- potassium bromate CAS 7758-01-2
- potassium chlorate CAS 3811-04-9
- potassium perchlorate CAS 7778-74-7
- sodium chlorate CAS 7775-09-9
- sodium perchlorate CAS 7601-89-0
- sodium peroxide CAS 1313-60-6
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.