P212 · Precautionary statementAvoid heating under confinement or reduction of the desensitizing agent

Precautionary · PreventionPhysicalDiffers: EUNot adopted: Mexico

P212 is the GHS precautionary statement “Avoid heating under confinement or reduction of the desensitizing agent”. UN GHS Annex 3 assigns it to Desensitized explosives (chapter 2.17), Category 1, 2, 3, 4. The English wording is the same as UN GHS Rev.11 in US OSHA and Canada. The wording differs in EU CLP. Not adopted in Mexico. Canada’s official French text is “Éviter l’échauffement en milieu confiné ou la diminution de l’agent flegmatisant”. In the UN GHS Rev.11 label matrix it is used with 3 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

Avoid heating under confinement or reduction of the desensitizing agent

UN GHS Rev.11, Annex 3, Table A3.2.2, PDF p. 315

US OSHA HCS

Same as UN

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

Avoid heating under confinement or reduction of the desensitizing agent.

29 CFR 1910.1200 App. C, matched by wording

EU CLP

Differs

EU_CLP_2025 · consolidated 1 Jul 2026

Avoid heating under confinement or reduction of the desensitising agent.

EU CLP, Annex IV, Part 2

Canada (EN)

Same as UN

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

Avoid heating under confinement or reduction of the desensitizing agent

GHS Rev.7 Annex 3 Table A3.2 (EN corrected per ST/SG/AC.10/30/Rev.7/Corr.1)

In GHS Rev.7 this statement is only assigned to classes or categories that the HPR does not adopt.

Canada (FR)

Adopted

WHMIS_2022 · SGH Rév.7, texte officiel

Éviter l’échauffement en milieu confiné ou la diminution de l’agent flegmatisant.

GHS Rev.7 Annex 3 Table A3.2 (EN corrected per ST/SG/AC.10/30/Rev.7/Corr.1)

Mexico (ES)

Not adopted

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

Not listed in NOM-018-STPS-2015 Appendix C/D.

Hazard classes and categories

Desensitized explosives (chapter 2.17) · Category 1, 2, 3, 4

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.

H206 H207 H208

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

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 P212. 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.