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Plastic materials used and characteristics The following is an overview and general description of processes and types of plastics used during the process of Plastic Molding. Depending on the application and product, any of the following may be used. Polyvinyl Chloride (PVC) this is a type of thermoplastic that's used in the manufacturing of many everyday products. PVC is generally regarded as a controversial material due to its toxic effect on the environment. PVC is cheap and easy to assemble. Polymerization-This is the chemical process of forcing small molecules to bond together. Polymer-A material made of very large molecules that generally do not have a crystalline structure. Polymers are more commonly referred to as plastics. Thermoplastics-A group of plastics that can be softened by heat, hardened by cooling, and then softened again by heat, which makes them recyclable as this cycle can repeat in a heat-freeze cycle. Since Thermoplastics become soft, easier to mold and rendered more weldable when heat is added (It's more pliable than thermosetting) Resin- A raw polymer usually in the form of beads or pellets, that is not yet formed into its final molded shape.
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