Physical hazard · Oxidising liquids · Oxidising solids
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 · Oxidising solids 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 · Languages
H271 in the 24 official EU languages
A label put on the market in an EU country must carry the wording of that country's own language version of CLP — not a translation of the English one. These 24 lines are quoted from the consolidated regulation, Annex III, and are the text to print.
| Language | Official wording of H271 |
|---|---|
| BG български Bulgarian | Може да предизвика пожар или експлозия; силен окислител. |
| ES español Spanish | Puede provocar un incendio o una explosión; muy comburente. |
| CS čeština Czech | Může způsobit požár nebo výbuch; silný oxidant. |
| DA dansk Danish | Kan forårsage brand eller eksplosion, stærkt brandnærende. |
| DE Deutsch German | Kann Brand oder Explosion verursachen; starkes Oxidationsmittel. |
| ET eesti Estonian | Võib põhjustada süttimise või plahvatuse; tugev oksüdeerija. |
| EL ελληνικά Greek | Μπορεί να προκαλέσει πυρκαγιά ή έκρηξη· ισχυρό οξειδωτικό. |
| EN English English | May cause fire or explosion; strong oxidiser. |
| FR français French | Peut provoquer un incendie ou une explosion; comburant puissant. |
| GA Gaeilge Irish | D'fhéadfadh sé a bheith ina chúis le tine nó le pléascadh; an-ocsaídeoir. |
| HR hrvatski Croatian | Može uzrokovati požar ili eksploziju; jaki oksidans. |
| IT italiano Italian | Può provocare un incendio o un'esplosione; molto comburente. |
| LV latviešu Latvian | Var izraisīt degšanu vai eksploziju, oksidētājs. |
| LT lietuvių Lithuanian | Gali sukelti gaisrą arba sprogimą, stiprus oksidatorius. |
| HU magyar Hungarian | Tüzet vagy robbanást okozhat; erősen oxidáló hatású. |
| MT Malti Maltese | Jista' jikkawża nar jew splużjoni; ossidant qawwi. |
| NL Nederlands Dutch | Kan brand of ontploffingen veroorzaken; sterk oxiderend. |
| PL polski Polish | Może spowodować pożar lub wybuch; silny utleniacz. |
| PT português Portuguese | Risco de incêndio ou de explosão; muito comburente. |
| RO română Romanian | Poate provoca un incendiu sau o explozie; oxidant puternic. |
| SK slovenčina Slovak | Môže spôsobiť požiar alebo výbuch; silné oxidačné činidlo. |
| SL slovenščina Slovenian | Lahko povzroči požar ali eksplozijo; močna oksidativna snov. |
| FI suomi Finnish | Aiheuttaa tulipalo- tai räjähdysvaaran; voimakkaasti hapettava. |
| SV svenska Swedish | Kan orsaka brand eller explosion. Starkt oxiderande. |
Source: CELEX:02008R1272-20260501, Annex III. © European Union, https://eur-lex.europa.eu — only the electronic Official Journal of the European Union is authentic. Irish is one of the 24 official languages and its H and P texts are printed inside the multilingual Annex tables, but no consolidated CLP has ever been published in Irish — which is why an Irish-primary label cannot be built here.
03 · 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
04 · 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 CAS 7790-98-9
- Barium chlorate CAS 13477-00-4
- Barium perchlorate CAS 13465-95-7
- Chromium chromate CAS 24613-89-6
- chromium trioxide CAS 1333-82-0
- Chromyl chloride CAS 14977-61-8
- 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.