GHS in Canada: How the Global Standard Works with WHMIS

GHS — the Globally Harmonized System of Classification and Labelling of Chemicals — is the UN standard for describing chemical hazards, and Canada implemented it in 2015 as WHMIS 2015. Here is what GHS standardizes, what stayed uniquely Canadian, and what the current amendments mean for suppliers and employers.

What does GHS standardize?

GHS standardizes four things — classification criteria, pictograms, label elements and the SDS format — and all four are visible in any Canadian workplace. 1 It does not replace national law; it gives national law a common vocabulary.

Classification criteria. GHS defines the hazard classes, categories and the test criteria that place a product in them, replacing national judgement with a common rulebook. That makes classification far more consistent across borders than it was before 2015 — but not automatically identical. GHS is a building-block system: each country chooses which hazard classes to adopt and which GHS revision to align with, so the same product can be classified differently in two GHS countries.

Pictograms. The red-bordered diamond and the symbols inside it are GHS. Of the ten pictograms shown in WHMIS guides, eight come directly from the GHS set, the environment pictogram is GHS too but carries no WHMIS classification, and biohazardous infectious materials is Canada's own — which is why a drum from an overseas supplier is legible to a Canadian worker without translation.

Label elements. GHS standardized the signal words — only "Danger" and "Warning" exist — and the hazard and precautionary statements, which are drawn from a fixed catalogue rather than written freehand by each supplier. The wording of a hazard statement encodes severity: "May cause cancer" and "Suspected of causing cancer" are different classifications, not different phrasings.

The SDS format. GHS fixed the 16-section SDS format — the number of sections, their order and their headings — which is why every safety data sheet you will ever open has PPE in section 8 and the revision date in section 16.

GHS vs WHMIS: what stayed uniquely Canadian?

GHS and WHMIS are not the same thing: WHMIS is Canadian law that implements GHS, and GHS itself is not law anywhere until a country enacts it. Canada adopted most of GHS and kept several things of its own:

• The biohazardous infectious materials pictogram. GHS has no equivalent hazard class — the symbol is Canada's own — the pictogram guide covers its history.
• Bilingual labels and safety data sheets. Supplier labels and SDSs must be in both English and French — as one bilingual document or as two supplied together. This is a Canadian requirement with no GHS counterpart, and it is a common compliance failure on imported product: a US HazCom-compliant, English-only sheet does not satisfy Canadian law. 4
• Environmental hazards and explosives left out. The GHS environmental classes weren't adopted into the HPR — which is why the environment pictogram carries no WHMIS classification even though it appears on internationally labelled products — and the GHS explosives classes weren't either, because explosives are regulated under the Explosives Act and excluded from the HPA. 5
• The legal wrapper. GHS enters Canadian law through the supplier-side HPA/HPR and the employer-side OHS rules — the legislation section of our WHMIS guide maps them all. The classification is global; the enforcement is entirely local.

Which GHS revision does Canada's amended HPR follow?

Canada's amended Hazardous Products Regulations (HPR) align primarily with the seventh revised edition of GHS, together with certain provisions from the eighth. 2,3 GHS is revised every two years, and countries adopt revisions on their own timetable — which is why "GHS-compliant" on its own means very little without a revision number.

The provisions taken from the eighth edition include the Chemicals Under Pressure hazard class. The amendments (SOR/2022-272) came into force on 15 December 2022 and were published in the Canada Gazette, Part II in January 2023.

The supplier transition period ended on 14 December 2025 — since that date, every hazardous product sold, imported or distributed in Canada must be classified, labelled and documented to the amended rules. 2,3

What changed: the new Chemicals Under Pressure class, revised criteria for aerosols and flammable gases, changes to the information required in several SDS sections, and clarifications to concentration limits and mixture rules.

For most employers the practical consequence is simple: if an SDS on file predates December 2022, confirm with the supplier that it reflects the amended rules — stock bought before the deadline can stay in service, but the sheet behind it has to be current. 4

The Canadian and U.S. timelines have now separated. Canada's transition ended on 14 December 2025. In January 2026, OSHA extended the U.S. Hazard Communication Standard deadline for hazardous mixtures to 19 November 2027. 6

In its March 2026 program newsletter, Health Canada said it will focus on compliance promotion with regulated parties until the end of that U.S. compliance deadline, while retaining the authority to enforce at any time. 7 For suppliers on both sides of the border, that means a compliant Canadian classification is required now, even where the equivalent U.S. document has longer to run.

What must importers, suppliers and employers do?

Suppliers, importers and distributors must classify, label and document each product; employers must train exposed workers and keep labels and SDSs current. The duties split cleanly by role, and mixing them up is the most expensive mistake in this area.

Suppliers, manufacturers, importers and distributors must classify each product against the HPR criteria, apply a compliant bilingual supplier label, and provide a compliant bilingual safety data sheet at the time of sale. When significant new data emerges they have 90 days to update the SDS and 180 days to update the label — and in the meantime, any sale must be accompanied by a separate written document giving the required changes. They must also keep true copies of labels and SDSs, plus sales and purchasing records, available for inspection. 3

Two traps live here. A distributor who repackages or relabels a product becomes a manufacturer in law. And an employer who imports a hazardous product for use in their own workplace is an importer — with the supplier obligations that follow, including producing a compliant bilingual label and SDS if the foreign supplier's documents are English-only. 4

Employers acting as employers rely on supplier classification and supplier documents. Their employer duties under WHMIS are to educate and train exposed workers, make sure products in the workplace are properly labelled, keep current SDSs accessible, and have appropriate control measures in place. The one addition: an employer who produces a hazardous product on site for use on site must meet the supplier requirements for that product, including classifying it and preparing an SDS.

Is GHS part of WHMIS?

Yes — current WHMIS incorporates the GHS classification, pictogram and SDS framework into Canadian law, so the classification logic, the pictograms and the 16-section format are all part of WHMIS training.