Class D extinguishers are specifically tested against which type of materials?

Class D extinguishers are specifically designed and tested for use on fires involving combustible metals. These metals include materials like magnesium, titanium, sodium, and potassium, which behave very differently in a fire compared to common flammable substances.

The unique characteristics of combustible metals require specialized extinguishing agents that can effectively smother or control these intense and hazardous fires. Typical extinguishing agents, such as those used for Class A (ordinary combustibles) or Class B (flammable liquids) fires, are often ineffective and can even exacerbate a fire involving combustible metals.

This specificity is crucial for fire safety because using the wrong type of extinguisher can lead to explosive reactions or worsen the fire's intensity, underscoring the importance of having the proper training and understanding of fire classifications and the appropriate extinguishing methods.