Помогите перевести текст.plastics Plastic materials are not found as such in

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plastics
Plastic materials are not found as such in nature .They have many advantages over such materials as metals, glass and wood. One of them is lightness. A given volume of polythene weights less that one-eighth of an equal volume of iron and less then half of the same volume of aluminium.
While some types of plastics are very tough, e g., nylon, and others may be relatively brittle as say. polystyrene, they are. with few exceptions, not as strong as iron or steel or concrete when it comes to supporting great weights.
Plastics do not rust and therefore require no protective layer, such as paint, which can subsequently peel off. They can. of course, be coloured and such colour is part ot the material. It cannot come away or be chipped off. Plastics do not like heat. Some types will withstand higher temperatures than others and the ceiling temperature is constant!) being raised as new varieties appear.
Plastics have found wide application both in everyday life and in industry. We can hardly name a branch of industry where plastics are not applied. The insulation and dielectric properties of plastics led to their early use in the electrical engineering industry, which was followed by special application in mechanical engineering. The use of plastics as materials of construction in the form of sheets, rods or tubes are substituting the conventional metals. Automibile, aircraft and shipbuilding industries have also made use of advantages offered by plastics,.