2.THE CLASSIFICATION OF PLASTICS.

KEY CONCETS:

1. Thermoplastics are usually made from petroleum products.The most common thermoplastics are:

• Polyethylene terephthalate(PET).
• High-density polyethylene.
• Polyvinyl chloride(PVC).
• Low-density polythylene.
• Polypropylene.
• Moulded polystyrene.
• Expanded polystyrene or Styrofoam.

 2. Thermosetting plastics are made from petroleum products.They include:

• Polyurethane
• Bakelite
• Melamine
• Polyester resins

 3. Typical elastomers include rubber and neoprene.