"Class K" covers cooking oils and fats .
Class K extinguishers are designed to fight cooking fat, oil, and grease fires, such as deep fryers. The chemicals inside these extinguishers react with the grease to form a foamy layer that will not burn.
Class B: Class B extinguishers are used on fires involving flammable liquids, such as grease, gasoline, oil, and oil-based paints.
Class B extinguisher
No, hence them being Class D fire extinguishers they are only used on combustible metal fires. there are different class d extinguishers as well for specific metal fires no one class d extinguisher on all metal fires mostly very specific
Class C fire Extinguishers
Extinguishers with a Class C rating (C can be used on Currents)
Class D Class D fire extinguishers are used for various types of flammable metals. A class D fire extinguisher can contain sodium chloride, graphite, or copper powder. A sodium chloride fire extinguisher would be used on metals containing magnesium, sodium, potassium, and sodium-potassium alloys. Copper and graphite fire extinguishers would be used for lithium and lithium alloy fires.
Class K extinguishers are used on Class K fires, i.e., kitchen grease. It may use a special high-temperature foam that causes saponification of the fat and oil, causing it to be extinguished.
Class A extinguishers are designed for "ordinary flammable materials" (organic solids such as paper and wood) but not liquids like gasoline, grease, electrical fires, or flammable metals.
Class K extinguishers are used on Class K fires.
Carbon dioxide fire extinguishers can be used on Class B, C and E.
Class B extinguishers are used for liquid fires, typically gasoline and oil fires. Extinguishers rated ABC will be effective against all three classes, but seldom as effective as a dedicated Class B extinguisher.