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In page Plastic:

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The word plasticity, as a noun, specifically refers to the deformability of the materials used in the manufacture of plastics. Plasticity allows molding, extrusion, or compression into a variety of shapes, including films, fibers, plates, tubes, bottles, and boxes, among many others. In materials science, plasticity also has a more technical definition, describing the nonreversible change in form of solid substances when subjected to external forces. However, this definition extends beyond the scope of this article.[citation needed]