Which Class of Fire involves combustible metals or combustible metal alloys such as magnesium, sodium and potassium?

Fire classifications categorize fires based on the type of fuel involved. A Class D fire is defined as one that involves combustible metals, such as magnesium, titanium, zirconium, sodium, and potassium. These types of fires are particularly hazardous as they can react violently with common extinguishing agents like water, and they require special dry powder agents specifically designed for the metal involved. Data center environments must account for all fire classes, including the potential for Class D fires if such metals are present.

A. Class A: This class involves ordinary combustible materials like wood, paper, cloth, and most plastics, not combustible metals.
B. Class B: This class involves flammable or combustible liquids and gases, such as gasoline, alcohol, oil-based paints, and propane.
C. Class C: This class involves fires in energized electrical equipment, where the use of a non-conductive extinguishing agent is required.

1. Massachusetts Institute of Technology (MIT), Environment, Health & Safety. (n.d.). Fire Extinguisher Types and Classes. MIT EHS. Retrieved from https://ehs.mit.edu/fire-safety-program/fire-extinguishers/fire-extinguisher-types-and-classes/.

Reference Detail: Under the section "Classes of Fire," the document states, "Class D fires are fires in combustible metals, such as magnesium, titanium, and sodium."

2. University of Washington, Environmental Health & Safety. (n.d.). Fire Extinguisher Training. UW EH&S. Retrieved from https://www.ehs.washington.edu/fire-life-safety/fire-extinguisher-training.

Reference Detail: In the "Classes of Fire" section, it specifies, "Class D: Combustible metals such as magnesium, titanium, potassium and sodium."

3. Princeton University, Environmental Health and Safety. (n.d.). Fire Extinguishers. EHS. Retrieved from https://ehs.princeton.edu/fire-safety/fire-extinguishers.

Reference Detail: The "Fire Classifications" table explicitly lists "Class D" with the description "Combustible metals; e.g., magnesium, sodium, potassium, titanium, zirconium, and other flammable metals."