What type of fire should saltwater be avoided on?

• A. Class B (flammable liquids)
• B. Class A (wood and paper)
• C. Class C (electrical)
• D. Class D (metal)

Answer: (B)

Saltwater should be avoided on Class D fires, which involve combustible metals, such as magnesium, titanium, and sodium. Using saltwater on a Class D fire can lead to hazardous reactions and exacerbation of the fire. Saltwater can react with certain metals, producing flammable hydrogen gas and potentially causing explosions or spreading the fire further.

While it may seem logical to consider saltwater for fires involving common materials like wood and paper, Class A fires are typically controlled using water, while Class D fires necessitate specialized extinguishing agents designed specifically for those materials. Understanding the nature of Class D fires and how saltwater interacts with combustible metals is crucial for effective damage control and safety.