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A letter D marking combustible metal fires.
Also known as: Class D fire, Metal fire class, Combustible metal fire, Letter D on an extinguisher
Class D is metal fires — magnesium, lithium, sodium. Water is not merely ineffective but reacts, and carbon dioxide does too, so a class D fire needs a dry powder agent formulated for the specific metal. The wrong extinguisher makes it worse.
Denotes fires involving combustible metals such as magnesium, titanium, sodium and lithium.
Contexts: Public information
Reacts with water and with carbon dioxide rather than being extinguished by them, so standard agents actively worsen the fire.
Contexts: Public information
Requires a dry powder agent matched to the specific metal, since no single class D agent suits all of them.
Contexts: Public information
A capital letter D printed within a pictogram panel on an extinguisher label, alongside an image of burning metal shavings.