Class A- Fire in solid materials such as wood, paper, cloth, etc.
These materials have some properties such as: they leave residues when burned, burn in surface and in depth.
Class B- Fire in flammable liquids, greases and combustible gases.
These materials have some properties such as: they do not leave residues when burned and burn only on the surface.
Class C- Fire in energized electrical equipment, such as electric machines, power cabinets, etc. Extinguishing must be done by extinguishing agent that does not conduct electricity.
When the electric circuit is switched off, the fire becomes class A.
Class D - Fire fueled by pyrophoric metals such as magnesium, selenium, antimony, lithium, potassium, fragmented aluminum, zinc, titanium, sodium, uranium and zirconium. - very used in company
