Although every effort is made to ensure the accuracy, currency and completeness of the information, CCOHS does not guarantee, warrant, represent or undertake that the information provided is correct, accurate or current. CCOHS is not liable for any loss, claim, or demand arising directly or indirectly from any use or reliance upon the information.

The symbol within the pictogram shows an exploding bomb. Products with this pictogram present severe fire and explosion hazards. Significant injury and property damage could result from incidents involving these products.

In addition to the specific hazards identified by the exploding bomb pictogram, it is important to remember that the product may have other hazards, for example:

NOTE: The Explosives hazard class has not been implemented in WHMIS. In Canada, explosives are regulated under the Explosives Act. Providing detailed information about the hazards, safe handling and storage, and emergency procedures for explosives is beyond the scope of this document.

Organic peroxides are highly reactive, and tend to ignite easily and burn rapidly. Organic peroxides are very unstable and are generally sensitive to light (e.g., have to be stored in darkness). Some are sensitive to temperature changes or friction (e.g., shaking or bumping of the container). Organic peroxides tend to react explosively with metals.

WHMIS labels and safety data sheets are required for all hazardous products in the workplace. Before using these products, workers need to be educated on WHMIS, which was amended in December 2022.

The Explosives hazard class has not been implemented in WHMIS. However, you may see this hazard class identified on a safety data sheet or label. The Explosives hazard class is also assigned the exploding bomb pictogram and has the following categories:

These products may also be highly reactive with many other materials – check Section 10 (Stability and Reactivity) of the Safety Data Sheet (SDS) for incompatible materials.

Self-reactive substances and mixtures are sensitive to temperature and temperature changes. Heating (even slight heating), such as heating that may occur through improper handling or storage conditions, could result in a very hazardous situation.

Products with this pictogram are not commonly used because of their severe hazards. When used, they must be handled and stored in stringently controlled conditions, and specialized training and supervision are required.

*For these hazard classes, Type B is assigned two pictograms – the exploding bomb and the flame. Types C, D, E, and F are assigned the flame pictogram. Refer to How to Work Safely with - Hazardous Products Using the "Flame" Pictogram for information on Types C, D, E and F of these hazard classes.