CA-WR4 · WHMIS Label elementIn contact with water, releases gases which are harmful if inhaled
CA-WR4 is a WHMIS supplemental label element from the Hazardous Products Regulations: “In contact with water, releases gases which are harmful if inhaled”. The Regulations give it no code; CA-WR4 is the ID used on this site. It is used for Acute toxicity: gas released on contact with water, Category 4. Listed in Canada. Canada’s official French text is “Au contact de l’eau, libère des gaz nocifs en cas d’inhalation”.
Heading text: Canada HPR. Wording can differ by jurisdiction; see the table below.
Wording by jurisdiction
UN GHS Rev.11
Not in UNWHMIS element with no GHS code, not part of the UN GHS.
US OSHA HCS
Not adoptedNo matching OSHA App. C wording found.
EU CLP
Not adoptedNot listed in EU CLP Annex III or IV.
Canada (EN)
No GHS codeIn contact with water, releases gases which are harmful if inhaled
HPR s. 3(1)(f)(iii) and (g)(iii)
Canada (FR)
No GHS codeAu contact de l’eau, libère des gaz nocifs en cas d’inhalation
HPR s. 3(1)(f)(iii) and (g)(iii)
Mexico (ES)
Not adoptedNot listed in NOM-018-STPS-2015.
Hazard classes and categories
- Acute toxicity: gas released on contact with water, Category 4
Canada HPR
Change in UN GHS Rev.11
Not part of the UN GHS, so Rev.11 does not apply.
Notes
Canada-specific HPR wording with no GHS code. The HPR does not assign a code; "CA-WR4" is a lookup ID used on this page only.
Sources
Each cell in the table names the official table and page for CA-WR4. 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.