Which one of the following substances does not belong to class 'B' fir

Which one of the following substances does not belong to class ‘B’ fire ?

Molten Sulphur

Alcohol

Solvent

Paint

Answer is Right!

Answer is Wrong!

This question was previously asked in

UPSC CISF-AC-EXE – 2020

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Paint is the substance among the options that does not exclusively belong to Class ‘B’ fires, as it can also cause Class ‘A’ fires (e.g., dried paint) or be non-flammable (water-based paint).

– Class B fires involve flammable liquids and gases (e.g., petrol, oil, alcohol, propane).
– Alcohol and Solvents are standard examples of flammable liquids that cause Class B fires.
– Molten Sulphur, while solid at room temperature, burns as a flammable liquid when molten and is classified as a Class B fire hazard.
– Paint’s classification depends on its composition. Solvent-based paints cause Class B fires due to the flammable solvents. However, water-based paints contain minimal flammable solvents; their fire risk is primarily from the combustible solid components/residue, which would be a Class A fire. Dried paint is also a combustible solid (Class A).

Fire classification systems categorize fires based on the type of fuel involved, as different types of fires require different extinguishing agents. While many paints are Class B due to solvents, the general term ‘Paint’ is ambiguous and can include substances that result in Class A fires, making it the one least definitively belonging *only* to Class B among the options.

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