1, Class A fire refers to the fire of solid combustible materials, such as wood, cotton, wool, hemp, paper, etc.
2. Class B fire is the fire of nails, class B and class C liquids, such as gasoline, kerosene, diesel, methanol, ether and acetone.
3. Class C fire refers to the fire of combustible gas, such as gas, natural gas, methane, propane, acetylene, hydrogen, etc.
4. Class D fire refers to the fire in which metals burn, such as potassium, sodium, magnesium, titanium, lithium, aluminum and magnesium alloys.
5. Class E fire refers to the fire that is charged when burning.