What do you think about plastic? Most people think plastic is light and easy to break. Because many people see and use in their children's toys and dishes. But there is a plastic that is harder than Iron.
That special plastic is engineering plastic. That is used in many factory and industry. Especially in car making. If they use engineering plastic when they are making a car, it makes the car much lighter and have simple internal structure. When a car that is made by engineering plastic run 100km, it can save fuel 0.3~0.5L. So when we use engineering plastic we can save energy and environment of Earth.
Engineering will be more popular in future society. In another part it can instead iron and other fiber which has feature that is hard.
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