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Plastics
- most are synthetic materials
- man- made, using chemical processes
- man- made, using chemical processes
- two types
- thermo-plastics
- get soft when heated, allowing their shape to change- will harden in new shape
- flxible
- most, plastics- available in sheets (which can be heated and formed) (bathtubs are made from vacuum forming)and powders
- injection moulding
- injection moulding
- hundreds of diff types
- acrylic
- rigid and clear with good impact resistance
- rigid and clear with good impact resistance
- nylon
- clothes
- bearings
- gears
- clothes
- polypropylene
- medical syringes
- rope
- crates
- storage boxes
- medical syringes
- acrylic
- get soft when heated, allowing their shape to change- will harden in new shape
- thermo-sets
- once formed, cannot be changed using heat
- hard and rigid
- products that are heat-resitant and keep shape
- urea formaldehyde
- elec sockets
- elec sockets
- melamine formaldehyde
- hard, rigid and strong- plastic bowls, laminated surfaces
- hard, rigid and strong- plastic bowls, laminated surfaces
- exoxy resin and polyester resin
- reinforced with glass fibre- canoes
- good chem resitance, but can be brittle
- reinforced with glass fibre- canoes
- urea formaldehyde
- are normally available as different chemicals to mix together
- cannot normally be recycled
- cannot normally be recycled
- once formed, cannot be changed using heat
- thermo-plastics
- most made form crude oil
- drilling deep into ground/ sea
- broken down into simple parts: monomers
- attached together to form polymers: the pure form of any plastic
- attached together to form polymers: the pure form of any plastic
- non-renewable
- pollution and damage to environment
- plastics often end up buried in landfill- and they take 100s of years to break down- so this is a problem
- but some are made form bio-degradable sustainable sources
- drilling deep into ground/ sea
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