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Why are sheets of plastic often covered with a layer of plastic or paper?
Wiki User
∙ 11y ago
These layers protect against accidental scratching and therefore need to be kept on long as possible.
Wiki User
∙ 11y ago
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What are the plastic sheets behind the red carpet called?
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How often should you change your sheets?
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How are some metals protected from chemical change?
chemical changes can corrode, or wear away metals used in industry and construction. to prevent the metals from being weakened, they are often covered with a layer of another substance. Galvanized steel, for example, has a thin coating of zinc, a metal that's more reactive than steel. by reacting itself, the zinc prevents corrosive materials from reacting with the steel. steel is sometimes covered with a thin layer of chromium, a nonreactive metal. this seals the steel against corrosive chemicals.
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