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Answer: Engineering plastics are a class of plastic materials that have superior mechanical and/or thermal properties to commodity plastics. In many applications, manufacturing plastics have increasingly replaced conventional engineering materials such as wood or metal. Engineering plastics, in addition to equaling or exceeding them in weight/strength and other properties, are much simpler to produce, particularly in complex forms. Speciality plastics are those that follow more stringent specifications than regular or engineering plastics. They are more costly and are used in smaller quantities.