1. Learning Intentions: We will learn about different kinds of plastic, their uses and how to form them I will know I am successful if: I understand the difference between thermoplastics and thermosetting plastics I am able to suggest an appropriate plastic by looking at the properties I have practiced the shaping and finishing of acrylic by filing and cutting simple shapes

2. Types of Plastic Thermoplastics -Thermoplastics soften when heated. -They can be shaped when heated and harden as they cool. -When reheated they can be reshaped unless damaged be excessive heat

3. Types of Plastic Thermosetting Plastics -This type of plastic SETS when heated -Thermosetting plastics cannot be returned to their original state by further heating What does that mean for recycling…?

4. Properties of Plastics Thermosetting Epoxy Resin -Hard, heat resistant, electrical insulator Melamine formaldehyde -Hard, heat resistant, resists some chemicals and resists stains Thermoplastics Acrylic -Hard, easy cut, scratches easy, brittle, polishes well PVC (Polyvinylchloride) -Hard and stiff, OR soft and flexible…

5. Uses of Plastics Did you know…? -The Plastic in every product is carefully selected for the job. Acrylic -Hard, easy cut, scratches easy, brittle Polystyrene -Stiff, wide range of colours, very light, buoyant PVC (Polyvinylchloride) -Hard and stiff, OR soft and flexible… Fishing Float

6. Uses of Plastics Did you know…? -The Plastic in every product is carefully selected for the job. Acrylic -Hard, easy cut, scratches easy, brittle Polystyrene -Stiff, wide range of colours, very light, buoyant PVC (Polyvinylchloride) -Hard and stiff, OR soft and flexible… Fishing Float

7. What Plastic are we using today? Acrylic!

8. Marking out your acrylic The acrylic will have a protective layer on it This prevents scratching. When covered you can mark with a pencil or pen Unprotected sheets are best marked with a felt-tipped pen!

9. Cutting tools Tenon Saw Hacksaw Coping Saw Junior Hacksaw

10. Let’s Get Shaping!!

11. The Strip Heater Best used for bending narrow strips of acrylic Protective cover is removed Area to be bent is marked with a pen After heating, the acrylic can be shaped by using a jig

12. Oven For more complex shaping For 3mm thick acrylic, the oven is set to 170 degrees C Heated for approximately 15-20 minutes before forming Approximately 20 minutes

13. Were we successful? I understand the difference between thermoplastics and thermosetting plastics I am able to suggest an appropriate plastic by looking at the properties I have practiced the shaping and finishing of acrylic by filing and cutting simple shapes