WHMIS provides information about hazardous chemicals mainly through three key tools: labels on containers, detailed Safety Data Sheets (SDS), and worker education and training.

Quick Scoop

1. What WHMIS Is Doing in Plain Terms

WHMIS (Workplace Hazardous Materials Information System) is Canada’s national system for telling workers exactly what dangers a product has and how to work with it safely.

It’s built around clear hazard communication so that anyone who handles a chemical can quickly see the risks and the precautions they need to take.

2. The Three Main Ways WHMIS Provides Information

  1. Labels on hazardous products
    • Every hazardous product container must have a WHMIS‑compliant label.
 * Labels show:
   * Product identifier (name of the chemical/product).

   * Hazard pictograms (symbols like flame, skull and crossbones, corrosion).

   * Signal word (e.g., “Danger” or “Warning”).

   * Hazard statements (e.g., “Causes skin irritation,” “May cause cancer”).

   * Precautionary statements (e.g., “Wear protective gloves,” “Keep away from heat”).

   * Supplier information (name, address, phone number).

 * A worker can glance at the label and instantly know: “What can this do to me?” and “What should I do to stay safe?”
  1. Safety Data Sheets (SDS)
    • Each hazardous product must have an SDS that is readily accessible to workers.
 * The SDS gives much more detailed information than the label, including:
   * Hazard identification (Section 2 – hazard class, category, pictograms, hazard statements).

   * Composition/ingredients and their concentrations.

   * First‑aid measures (what to do if someone is exposed).

   * Fire‑fighting measures (what kind of fire extinguisher, special hazards).

   * Accidental release measures (spills, leaks, clean‑up).

   * Handling and storage instructions.

   * Exposure controls and PPE (what protective gear is needed).

   * Physical and chemical properties (appearance, flash point, boiling point, etc.).

   * Toxicological information (how it can harm health, routes of exposure).

 * If the label is the “headline,” the SDS is the **manual** for that chemical.
  1. Worker education and training
    • WHMIS requires that workers receive education and training about the hazardous products they use.
 * Education covers general WHMIS concepts: labels, pictograms, SDS, and types of hazards.

 * Workplace‑specific training covers: the actual chemicals on site, where SDSs are kept, and the specific procedures for safe use, emergencies, and PPE.

 * Employers must keep training records and regularly review the WHMIS program to ensure it is effective.

3. How WHMIS Classifies Hazards (Why This Matters)

WHMIS classifies hazardous products into physical and health hazard classes so the same types of chemicals are described in a consistent way.

  • Physical hazard classes include:
    • Flammable gases, liquids, solids (catch fire easily).
* Oxidizing gases, liquids, solids (can intensify fires).

* Gases under pressure (risk of explosion, cryogenic burns).

* Self‑reactive substances, pyrophoric materials, self‑heating substances, water‑reactive substances, organic peroxides, corrosive to metals, combustible dusts, chemicals under pressure, etc.
  • Health hazard classes include:
    • Acute toxicity (can cause harm or death quickly if inhaled, swallowed, or absorbed through skin).
* Skin corrosion/irritation and serious eye damage/irritation.

* Respiratory or skin sensitization (can cause asthma‑like reactions or allergic skin responses).

* Germ cell mutagenicity, carcinogenicity, reproductive toxicity.

* Specific target organ toxicity (single or repeated exposure), aspiration hazard, biohazardous infectious materials, and “health hazards not otherwise classified.”

These classes and categories show up on Section 2 of the SDS and directly determine which pictograms and hazard statements appear on the label.

4. Putting It Together: How a Worker Uses WHMIS Info

Imagine a worker about to use a new solvent at a shop:

  • They look at the label first. They see a flame pictogram and the word “Danger,” with hazard statements like “Highly flammable liquid and vapour” and “Causes skin irritation.”
  • They check the SDS to learn: flash point, safe storage temperature, what PPE to wear, what to do if it spills, and what first‑aid is needed for skin contact or inhalation.
  • They rely on their WHMIS training to interpret the pictograms, follow their workplace procedures for handling and storage, and know where emergency equipment and SDS binders are.

Through this combined system—standardized labels, detailed SDS, and structured training—WHMIS ensures that information about hazardous chemicals is clear, consistent, and always available where the chemical is used.

Information gathered from public forums or data available on the internet and portrayed here.