Purple K extinguishers are suitable for which classes?

• A. Class A
• B. Class B or C
• C. Class C
• D. Class A or B

Answer: (B)

Purple K is a dry chemical extinguishing agent geared for hydrocarbon fuels and electrical fires. It works by rapidly interrupting the chemical reactions occurring in the flame and forming a coating that helps smother the fuel and keep the flame from reigniting. Because of this action, Purple K is effective on Class B fires (flammable liquids) and Class C fires (electrical equipment). It’s not the best choice for ordinary combustibles, where cooling is more important, so it isn’t typically used for Class A fires. In short, Purple K extinguishers are suitable for fires involving flammable liquids and electrical equipment.