What Are the Main WHMIS Changes for 2025?

Everything employers need to know about the WHMIS 2022 Amendment — what changed, why it matters, and what you need to do before the 2025 deadline.

On December 15, 2022, Canada amended the Hazardous Products Regulations (HPR) to align with the latest editions of the Globally Harmonized System (GHS Rev. 7 & 8). These changes modernize WHMIS and make hazard communication clearer and more consistent worldwide. The term “WHMIS 2015” is now outdated—the system is simply called WHMIS.

Why Is WHMIS Changing?

The goal of these amendments is to improve clarity, accuracy, and global consistency. By harmonizing with international standards, Canadian workplaces benefit from more precise hazard information, reducing confusion and helping employers and workers make safer decisions.

What’s New in the WHMIS 2022 Amendment?

The amendments introduced several key updates:

  • New hazard class: “Chemicals Under Pressure” was added to address products that pose unique risks when stored or handled.
  • Aerosols redefined: The former “Flammable Aerosols” class is now simply “Aerosols,” with a new category for non-flammable aerosols.
  • Flammable gases clarified: Category 1 is now split into 1A and 1B, with pyrophoric and chemically unstable gases classified under 1A.
  • Health hazard refinements: Criteria for reproductive toxicity and water-activated toxicants were corrected for better accuracy.
  • Improved SDS requirements: Safety Data Sheets now include additional information elements to make hazard communication clearer.

These changes aim to make hazard classifications more precise and easier to understand, which ultimately supports safer workplaces.

The Transition Period

The amendments came into force on December 15, 2022, but workplaces have until December 14, 2025 to fully comply. During this transition, suppliers can follow either the old or new requirements—but after that, the updated WHMIS rules will be mandatory.

What should employers do?

  • Update labels and Safety Data Sheets to reflect new hazard classes and categories.
  • Revise training materials so employees understand the updated terminology.
  • Communicate changes clearly to ensure compliance and safety.

Need to know more about the changes to WHMIS?

The new and updated SafetyVantage WHMIS Course is now available, so you can stay compliant, understand the latest requirements, and keep your workplace safe.