Fires involving solid substances, mainly of an organic nature, which normally cause glowing fires, e.g. car tyres, wood, coal, some plastics, paper, straw and textiles. Fires involving gases, e.g. acetylene, methane, propane, town gas, hydrogen.
Fires involving liquid or liquefiable substances, e.g. ether, alcohols, benzine, paints, oils, fats, resins, most plastics, tar, waxes. Fires involving metals, e.g. aluminium, potassium, lithium, magnesium, sodium and their alloys.