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Home>Glossary
283. Plastic is not metal
The properties of plastics materials can vary over a far wider range than all other engineering materials. Through the addition of fillers/reinforcing materials and modifiers the property profile of virtually any base polymer can be radically altered. Most basic properties of plastics, however, form a marked contrast to those of metals. For example, in a direct comparison, metals have higher of engineering thermoplastics are greater by orders of magnitude. To produce functional parts in plastic molding and at the same time save costs, radical design modification is generally necessary if the plastic is being used to replace metal. This process affords an opportunity for complete redesign of the component with possible integration of functions and geometric simplification.
Plastics sometimes exhibit completely different behaviour to that of metals under the same service conditions. For this reason, a functionally efficient, economic design in cast metal can easily fail if repeated in plastic with excessive haste. Plastics designers must therefore be familiar with the properties of this group of materials.
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