Physical hazard · Organic peroxides · Self-reactive substances and mixtures

H241 — Heating may cause a fire or explosion

Physical hazard statements describe what the substance itself can do — explode, ignite, react, corrode metal. 3 substances with a harmonised EU classification carry this code.

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

01 · Wording

What H241 says

Official

Heating may cause a fire or explosion.

Source

CLP Annex III · Physical hazards

Classification

Organic peroxides · Self-reactive substances and mixtures GHS chapter 2.15

Category Type B · pictograms GHS01 (exploding bomb) , GHS02 (flame) · 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

H241 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 H241
BG български Bulgarian	Може да предизвика пожар или експлозия при нагряване.
ES español Spanish	Peligro de incendio o explosión en caso de calentamiento.
CS čeština Czech	Zahřívání může způsobit požár nebo výbuch.
DA dansk Danish	Brand- eller eksplosionsfare ved opvarmning.
DE Deutsch German	Erwärmung kann Brand oder Explosion verursachen.
ET eesti Estonian	Kuumenemisel võib süttida või plahvatada.
EL ελληνικά Greek	Η θέρμανση μπορεί να προκαλέσει πυρκαγιά ή έκρηξη.
EN English English	Heating may cause a fire or explosion.
FR français French	Peut s'enflammer ou exploser sous l'effet de la chaleur.
GA Gaeilge Irish	D'fhéadfadh téamh a bheith ina chúis le dóiteán nó le pléascadh.
HR hrvatski Croatian	Zagrijavanje može uzrokovati požar ili eksploziju.
IT italiano Italian	Rischio d'incendio o di esplosione per riscaldamento.
LV latviešu Latvian	Sakaršana var izraisīt degšanu vai eksploziju.
LT lietuvių Lithuanian	Kaitinant gali sukelti gaisrą arba sprogti.
HU magyar Hungarian	Hő hatására meggyulladhat vagy robbanhat.
MT Malti Maltese	It-tisħin jista' jikkawża nar jew splużjoni.
NL Nederlands Dutch	Brand- of ontploffingsgevaar bij verwarming.
PL polski Polish	Ogrzanie może spowodować pożar lub wybuch.
PT português Portuguese	Risco de explosão ou de incêndio sob a acção do calor.
RO română Romanian	Pericol de incendiu sau de explozie în caz de încălzire.
SK slovenčina Slovak	Zahrievanie môže spôsobiť požiar alebo výbuch.
SL slovenščina Slovenian	Segrevanje lahko povzroči požar ali eksplozijo.
FI suomi Finnish	Räjähdys- tai palovaarallinen kuumennettaessa.
SV svenska Swedish	Brandfarligt eller explosivt vid uppvärmning.

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 H241 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 H241
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 H241

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.

3 of 3 shown

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.