Plastics Flashcards
What are plastics
They’re man made materials
What’s the name of the type of plastic that comes from crude oil, coal and natural gas
Synthetic plastics
What’s plastic memory
Each time a plastic is related it will attempt to return to its original shape unless it’s been overheated or damaged.
What are the two main types of plastics
Thermoplastics and thermosetting plastics
Name three types of thermoplastics
Acrylic, polythene and polyvinyl chloride (PVC)
Acrylic is the most common plastic where
In a school workshop
What are thermoplastics made up of
Lines of molecules with few cross linkages
What are thermoplastics suitable for
Injection moulding, vacuum forming and blow moulding
What can acrylic be
Translucent (smoked), transparent (clear) or opaque (solid colour)
What is acrylic resistant to
Most acids and weather conditions
Acrylic is easily machined, cemented and what
Polished
Acrylic has 10x impact resistance than what
Glass
Splinters and also what easily
Scratches
What can acrylic be used for (name 5)
Light units
Illuminated signs
Watch and clock glasses
Simple lenses
Aircraft canopies and windows
Car rear light units
Skylights
Furniture,
Baths
Perspex sheer
What can polythene be moulded into because of its excellent moulding qualities
Almost any form
Name the two types of polythene
High density and low density
What can polythene be used to make
Bottles
Bowls
Toys
Tubes
Describe high density polythene
Rigid and hard
Describe low density polythene
Tough and flexible
What are generally made from high density polythene
Machine parts
What are generally made from low density polythene
Bottles
Polyvinyl chloride (PVC) is a tough material that can be as what
A hard material or a flexible form
What can PVC be wielded or bonded with
An adhesive
What is PVC used to make
Pipes
Raincoats
Long play records
Coating on electrical wires
Describe thermosetting plastics
They spare made up of lines of molecules which are heavily cross linked
What are thermosetting plastics ideal for
Pan handles
Kettle handles
Plugs
Many what are thermosetting plastics
Adhesives (glue)
Name 3 thermosetting plastics
Polyurethane
Melamine formaldehyde
Polyester reins
What’s polyurethane the basis of
Many paints and varnishes
Describe polyurethane
Very tough and has water resistant qualities
Describe melamine formaldehyde
Has a smooth surface and hygienic qualities
What’s melamine formaldehyde used to make
Plastic laminates
Electrical plugs and sockets
Describe polyester reins
A very tough material that can resist impact
What is the name of the type of material that’s very tough and can resist impact
Glass reinforced plastic (GRP)
What’s polyester reins used for
Car body repairs
Sailing boats
Corrugated sheet
Why is polyester reins used in these things
Because of its lightness, toughness and resistance to water
