Which statement about Class D fires is true?

Which statement about Class D fires is true?

• A. They are caused by ignitable metals
• B. Water is recommended
• C. They should be extinguished with foam
• D. They are not dangerous

Answer: (A)

Class D fires involve ignitable metals such as magnesium, titanium, sodium, or potassium. These fires are dangerous and require a special extinguishing approach—dry powder extinguishers or other metal-fire agents that smother the flame and absorb heat without reacting with the metal. Water is not recommended because many reactive metals react violently with it, producing hydrogen gas or causing an explosion, and foam doesn’t effectively isolate the metal either. So the correct statement is that Class D fires are caused by ignitable metals.

Class D fires involve ignitable metals such as magnesium, titanium, sodium, or potassium. These fires are dangerous and require a special extinguishing approach—dry powder extinguishers or other metal-fire agents that smother the flame and absorb heat without reacting with the metal. Water is not recommended because many reactive metals react violently with it, producing hydrogen gas or causing an explosion, and foam doesn’t effectively isolate the metal either. So the correct statement is that Class D fires are caused by ignitable metals.