Plastics

Plastics

1. Thermoplastic

   • Can be reheated and reshaped over and over.
     • Plastic Memory
       • Plastic will go back to original shape when reheated.
   • Examples
     • Acrylic
     • Polythene
     • Polyvinyl Chloride
     • Polyethylene

2. Thermosetting plastic

   • Can only be formed (heated and shaped) once. Once reheated it will burn.
   • Examples
     • Polyurethane
     • Melamine Formaldehyde
     • Urea Formaldehyde
     • Polyester resin

3. Forms

   • Injection Moulding
   • Extrusion
     • Cross section
       • Continuous shape all the way through
     • Examples
       • T-Section
       • L-Section
       • Square section
       • U-Section
       • I-Section
       • Circular Section
   • Blow Moulding
   • Compression