Fire extinguisher class 8 is not a standard classification for fire extinguishers. The classification of fire extinguishers is based on the type of fire they are designed to extinguish. There are five categories of fires:

• Class A: Fires caused by combustible materials, including paper, fabrics, timber, and other flammable solids.
• Class B: Fires caused by flammable liquids, such as paint, turpentine, and gasoline.
• Class C: Fires caused by flammable gases, including methane, butane, or hydrogen.
• Class D: Fires caused by combustible metals, including potassium or magnesium.
• Class K: Fires caused by burning grease or oil from the cooking process.

Different types of fire extinguishers are designed to fight different classes of fires. For example, water and foam extinguishers are useful for Class A fires, while carbon dioxide, halogenated hydrocarbons, or dry chemicals are suitable for Class B and C fires. Class D fires are ordinarily combated with dry chemicals, while Class K fires require special extinguishers designed for kitchen fires.

In summary, there is no such thing as a fire extinguisher class 8. Fire extinguishers are classified based on the type of fire they are designed to extinguish, and there are five categories of fires. Different types of fire extinguishers are designed to fight different classes of fires.