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Plastics (Properties of plastic (examples (polythene (bags, fertiliser…
Plastics
Properties of plastic
cheap to make, durable and molded easily
polythene
high density hard and rigid, plastic crates and dustbins
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polysterene
yoghurt pots, expanded by blowing gas into it during molding, gives polymer low density and excellent insulation
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low densities, used because they are light
examples
polythene
bags, fertiliser sacks, squeezy bottles, lunch boxes
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rigid PVC
pipes, gutters, window frame, floor tiles, curtain rails
strong, long lasting, weather resistant
flexible PVC
insulation electrical wires, hospipes, shower curtains
strong, long lasting, flexible insulator
Polystyrene
food containers, yoghurt pots, electrical components
strong, brittle, rigid, electrical insulator
Nylon
tights, carpets, ropes, combs, brushes, gear wheels
spun into fibres, hard wearings, slippery
Expanded plysterene
packaging, wall insulation, disposable coffee cups
low density, good heat insulators
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Origins of Plastics
crude oil, not much use, mixture of hydrocarbons, separated in oil refinery by fractional distillation
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