PLASTICS

PLASTICS

1. PROPERTIES

   • Electrical, thermal and acoustic insulators
   • Ductile and maleable
   • Light
   • Impermeable
   • Recyclables
   • Not biodegradable
   • Resistant

2. DEFINITION

   • Long chanis of molecules, mostly made of elemnt carbon
   • Origin of plastics: natural or synthetic
   • Transformation of plastics: raw matter, polymerisation process and product

3. CLASSIFICATION

   • Thermoplastics
     • They soften when heated
       • PET. HDPE. PVC. LDPE. PP. PS. Methacrylate. Teflon. Cellophane. Nylon.
   • Thermosetting plastics
     • When heated and moulded they can be shaped but they don't soften if heated again
       • PUR. Melamine. Bakelite.
   • Elastomers
     • They stretch. Obtained through the vulcanisation process
       • Natural rubber. Synthetic rubber. Neoprene.

4. PLASTIC FORMING AND MOULDING TECHNIQUES

   • Forming
     • Extusion. Calendaring. Vacuum forming.
   • Moulding
     • Blow moulding. Injection moulding. Compression moulding.

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