Help on accessing alternative formats, such as Portable Document Format (PDF), Microsoft Word and PowerPoint (PPT) files, can be obtained in the alternate format help section.
Dangerously Reactive Materials are unstable or highly reactive materials that can undergo extremely hazardous uncontrolled reactions.They can cause explosions, fires or extreme heating, with potential for significant personal injury and property damage. These materials are not commonly used in workplaces because of their hazards.When used, they must be handled and stored in stringently controlled conditions. Specialized training and supervision is required.
This WHMIS Class covers various dangerous reactions including:
In many cases the dangerous reaction can be controlled by adding a stabilizer or inhibitor. This is a chemical that is added in small amounts to the material to slow down or prevent an unwanted reaction such as polymerization. Many dangerously reactive materials are also highly reactive with many other incompatible materials.
Many of these materials also possess other hazardous properties. For example, Methyl ethyl ketone peroxide is also oxidizing (WHMIS Class C), very toxic (Class D1A), and corrosive (Class E).
Dangerously reactive materials require extreme caution during handling and storage because of the ease with which a hazardous reaction can start.You must know about conditions that could lead to instability or reactions [see the Stability and Reactivity section of the Material Safety Data Sheet (MSDS)] and make sure that they never occur.
Adequate engineering controls are essential to ensure safe working conditions, prevent emergencies and lessen the consequences of an accident. Engineering controlsmay include:
ENSURE that all engineering controls specified by the manufacturer are in place and working properly.
Plan and prepare for emergencies...
Emergencies involving dangerously reactive materials can happen very quickly and have catastrophic effects.
For additional information and resources, visit Workplace Hazardous Materials Information System - Official National Site and/or Canadian Centre for Occupational Health and Safety