Plastics Flashcards
What are plastics?(2 points)
- Man made materials
- Replaced traditional materials such as wood and metal
What does plastic memory do when it is heated?
It will attempt to go back to its original flat shape
When is the only time when plastic memory will not return to its original flat shape?
When it has been overheated or damaged
What are the names of the two main types of plastics?
Thermoplastics and Thermosetting plastics
How can Thermoplastics bend into a variety of shapes and forms?
When heated
What happens when Themoplastics turn cold?
It stiffens
Are Thermoplastics the same as Thermosetting plastics?
Give reasons.
Thermoplastics can be reshape and reheated many times whereas Thermosetting plastics can only be reshape once and the process can never be repeated.
How is Acrylic purchased?
In the form of sheets
What 3 different things can Acrylic be?
Translucent (smoked)
Transparent (clear)
Opaque (solid colour)
Why do you think that Acrylic is te most common plastic in the school workshop?
Because it comes in a range of different colours, it is safe with food, resistant to most acids and weather conditions and it is easily machined, cemented and polished.
What is Acrylic used for?
Watches and Clock glasses
Simple lenses
Give the two types of polythene and describe them briefly.
High density - rigid and hard
Low density - tough and flexible
What is polythene used for?
Bottles
Bowls
Toys
Polyvinyl chloride is a ____________ material
Complete the statement using one of the words below:
Soft Tough Rough Smooth Flexible
Polyvinyl chloride is a tough material
There are two forms of polyvinyl chloride.
What are they?
Polyvinyl chloride can be hard or flexible
