Plastics and their Properties. These icons indicate that detailed teacher’s notes or useful web addresses are available in the Notes Page. This icon indicates the slide contains activities created in Flash. These activities are not editable.
Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.
These icons indicate that detailed teacher’s notes or useful web addresses are available in the Notes Page.
This icon indicates the slide contains activities created in Flash. These activities are not editable.
For more detailed instructions, see the Getting Started presentation.
Take a few minutes to look around the room and identify some everyday plastics.
Can you find the following objects and decide what type of plastic they are made from?
Plastics can be broken down into two categories:
thermoplastics and thermosets.
Plastics have an extremely wide range of uses. Here are some common products made from thermoplastics.
Thermosets have different qualities to thermoplastics. Here are some uses for thermosets.
Plastics can also be worked in other ways.
When plastic is used to make a large number of identicalproducts, industrial processes are used. Specialized machines are used to mass produce products. Press play to see a video of the vacuum forming process.
The injection moulding process involves heating plastic granules to their melting point and then injecting them at high pressure through a nozzle into a mould. When the plastic cools the mould is opened and the newly formed plastic part can be removed.
What similarities and differences can you identify between the vacuum forming and injection moulding processes?
Materials can be joined temporarily or permanently. Three methods of joining plastic are shown below.
Nut, bolt and
Plastics have excellent surface qualities. As they are self-finishing, plastics require little or no surface finish. However, when designers want a specific colour or texture, spray paints can be used.