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On site a multitude of materials and products can burn for example: wood from formwork, insulation materials, paints, varnishes, electrical installation, machines, welding gasses, wrapping material, waste, etc. Fire is produced by a chemical reaction between: a combustible (any substance that is able to burn) and a burning agent (oxygen) present in the air. For the reaction to start a contribution of heat is necessary (for example, a welding spark).
