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.

EU CLP: currentUS OSHA HazCom: currentUS HazCom 2012: currentUN GHS: current

01 · Wording

What H270 says

Official

May cause or intensify fire; oxidiser.

Source

CLP Annex III · Physical hazards

Classification

Oxidising gases GHS chapter 2.4

Category 1 · pictogram GHS03 (flame over circle) · signal word Danger

UN GHS history

Unchanged since 2009.

Rev.3 2009

Rev.4 2011

Rev.5 2013

Rev.6 2015

Rev.7 2017

Rev.8 2019

Rev.9 2021

Rev.10 2023

Rev.11 2025

wording never changed

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

H270 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 H270
BG български Bulgarian	Може да предивзика или усили пожар; окислител.
ES español Spanish	Puede provocar o agravar un incendio; comburente.
CS čeština Czech	Může způsobit nebo zesílit požár; oxidant.
DA dansk Danish	Kan forårsage eller forstærke brand, brandnærende.
DE Deutsch German	Kann Brand verursachen oder verstärken; Oxidationsmittel.
ET eesti Estonian	Võib põhjustada süttimise või soodustada põlemist; oksüdeerija.
EL ελληνικά Greek	Μπορεί να προκαλέσει ή να αναζωπυρώσει πυρκαγιά· οξειδωτικό.
EN English English	May cause or intensify fire; oxidiser.
FR français French	Peut provoquer ou aggraver un incendie; comburant.
GA Gaeilge Irish	D'fhéadfadh sé a bheith ina chúis le tine nó cur le tine; ocsaídeoir.
HR hrvatski Croatian	Može uzrokovati ili pojačati požar; oksidans.
IT italiano Italian	Può provocare o aggravare un incendio; comburente.
LV latviešu Latvian	Var izraisīt vai pastiprināt degšanu, oksidētājs.
LT lietuvių Lithuanian	Gali sukelti arba padidinti gaisrą, oksidatorius.
HU magyar Hungarian	Tüzet okozhat vagy fokozhatja a tűz intenzitását, oxidáló hatású.
MT Malti Maltese	Jista' jikkawża jew iżid in-nar; ossidant.
NL Nederlands Dutch	Kan brand veroorzaken of bevorderen; oxiderend.
PL polski Polish	Może spowodować lub intensyfikować pożar; utleniacz.
PT português Portuguese	Pode provocar ou agravar incêndios; comburente.
RO română Romanian	Poate provoca sau agrava un incendiu; oxidant.
SK slovenčina Slovak	Môže spôsobiť alebo prispieť k rozvoju požiaru; oxidačné činidlo.
SL slovenščina Slovenian	Lahko povzroči ali okrepi požar; oksidativna snov.
FI suomi Finnish	Aiheuttaa tulipalon vaaran tai edistää tulipaloa; hapettava.
SV svenska Swedish	Kan orsaka eller intensifiera brand. 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 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

04 · 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.

5 of 5 shown

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
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).

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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.