The Time Project
Lesson 4: Plastics answers
 


1. Which type of plastic would be suitable to manufacture washing up liquid bottles from?

Answer: Low density polythene (Low density polyethylene)

2. Give two reasons as to why acrylic is used to make external signs?

Answer: Very durable outdoors, ten times more impact resistance than glass.

3. Name a suitable plastic used to transport medical supplies on board ships?

Answer: Expanded polystyrene (Expanded polyphenylethane).

4. A manufacturer intends to sell mechanical miniature children's cars. It has decided to make part of the gearing system from plastics. Which tough plastic with a good bearing surface would you recommend?

Answer: ABS (acrylonitrilebutadienestyrene).

5. Give two reasons as to why guttering and drainpipes are made from Rigid PVC?

Answer: Light weight. Very good acid and alkali resistance. Can be used outdoors if suitably stabilised.

6. Name one property of acrylic that may prove to be a disadvantage?

Answer: Splinters easily. Scratches easily.

7. The handles of mild steel screwdrivers made in the school workshop need to be protected through the process of dip coating. Which plastic could be used? The same plastic is used to insulate electrical wires.

Answer: Low density polythene (Low density polyethylene).

8. Name a suitable plastic used in the boat industry to make small rowing boats?

Answer: Polyester resin (Unsaturated polyester resin).

9. Which transparent plastic is used to make the windows of garden sheds? Explain why you think it is preferred to glass?

Answer: Acrylic ( Polymethyl methacrylate). Trade name:Perspex

10. Gear systems need to be self lubricating, resistant to oil and have good fatigue resistance. Name a suitable plastic?

Answer: Nylon( Polyamide).



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