P370+P378 · Precautionary statementIn case of fire: Use ... to extinguish.

Precautionary · ResponsePhysicalCombined

P370+P378 is the GHS precautionary statement “In case of fire: Use ... to extinguish”. UN GHS Annex 3 assigns it to 10 hazard classes. The English wording is the same as UN GHS Rev.11 in US OSHA, EU CLP and Canada. Canada’s official French text is “En cas d'incendie: Utiliser… pour l'extinction” and Mexico’s Spanish text is “En caso de incendio, utilizar... para la extinción”. In the UN GHS Rev.11 label matrix it is used with 13 hazard statements (UN only).

Maintained by Valenc. Data checked 2026-10-20.

Heading text: UN GHS Rev.11 Annex 3. Wording can differ by jurisdiction; see the table below.

Wording by jurisdiction

UN GHS Rev.11

Same as UN

GHS Rev.11 (2025), Annex 3

In case of fire: Use ... to extinguish.

UN GHS Rev.11, Annex 3, Table A3.2.3, PDF p. 330

US OSHA HCS

Same as UN

HCS 2024 · primarily GHS Rev.7, some Rev.8

In case of fire: Use … to extinguish.

29 CFR 1910.1200 App. C, matched by wording

EU CLP

Same as UN

EU_CLP_2025 · consolidated 1 Jul 2026

In case of fire: Use… to extinguish.

EU CLP, Annex IV, Part 2

Canada (EN)

Same as UN

WHMIS_2022 · GHS Rev.7 (Rev.8 for chemicals under pressure)

In case of fire: Use ... to extinguish.

GHS Rev.7 Annex 3 Table A3.2

Canada (FR)

Adopted

WHMIS_2022 · SGH Rév.7, texte officiel

En cas d'incendie: Utiliser… pour l'extinction.

GHS Rev.7 Annex 3 Table A3.2

Mexico (ES)

Adopted

NOM-018-STPS-2015 · GHS 5th revised edition

En caso de incendio, utilizar... para la extinción

NOM-018-STPS-2015, DOF 9 October 2015, Apéndice D, Tabla D.1, PDF p. 37

Hazard classes and categories

Chemicals under pressure (chapter 2.3) · Category 1, 2
Flammable liquids (chapter 2.6) · Category 1, 2, 3, 4
Flammable solids (chapter 2.7) · Category 1, 2
Self-reactive substances and mixtures (chapter 2.8) · Category Types C, D, E, F
Pyrophoric liquids (chapter 2.9) · Category 1
Pyrophoric solids (chapter 2.10) · Category 1
Substances and mixtures which, in contact with water, emit flammable gases (chapter 2.12) · Category 1, 2, 3
Oxidizing liquids (chapter 2.13) · Category 1, 2, 3
Oxidizing solids (chapter 2.14) · Category 1, 2, 3
Organic peroxides (chapter 2.15) · Category Types C, D, E, F

UN GHS Rev.11 Annex 3, sections 1 and 2

H statements it is used with in the UN GHS Rev.11 label matrix only

UN GHS Rev.11 only. EU CLP, US OSHA, Canada (GHS Rev.7) and Mexico assign their own P statements; check the regulation for your market.

H224 H225 H226 H227 H228 H242 H250 H260 H261 H271 H272 H282 H283

UN GHS Rev.11 Annex 3, section 3. Listed for at least one category that uses each H statement.

Conditions for use

if water increases risk. ... Manufacturer/supplier or the competent authority to specify appropriate media.

Quoted as published in UN GHS Rev.11 Annex 3, section 2. List markers are shown as bullets.

Related codes

P370 P378

Change in UN GHS Rev.11

No change to the wording or the hazard classes in Annex 3 compared with Rev.10.

Sources

Each cell in the table names the official table and page for P370+P378. Full citations, links and revision notes for UN GHS Rev.11, US OSHA, EU CLP, Canada and Mexico: Sources and revision notes.

These are regulatory phrases for labels and safety data sheets. Check them against the official source for your jurisdiction before use.