6 Plastics (Polymers)Compared to metals, plastics have lower density, strength, elastic modulus, and thermal and electrical conductivity, and a higher coefficient of thermal expansionThe design of plastic parts should include considerations of their low strength and stiffness, and high thermal expansion and low resistance to temperature.
8 “The Process of Converting Raw Materials Into Products” Manufacturing“The Process of Converting Raw Materials Into Products”
9 Manufacturing a Product: General Considerations Material SelectionProcessing MethodsFinal Shape and AppearanceDimensional and Surface FinishEconomics of ToolingDesign RequirementsSafety and Environmental Concerns
10 Choosing Methods of Production Use a Selection Chart
17 Manufacturing Processes for Plastics Plastics are shipped to manufacturing plants as pellets or powders and are melted just before the shaping process. Polymers melt at relatively low temperatures and are easy to handle.Plastics can be molded and formed, as well as machined and joined, into many shapes with relative ease.