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Polymers section of D&T IGCSE Edexcel part 1
PVC(Polyvinyl chloride )
powder granules |
chemical ,weather resistance |
window frames |
wide range of techniques |
sheet |
|
cable insulation |
needs UV stabilisers to stop from fading caused by sunlight |
1.47 g/cm3 |
|
pencil cases |
| |
|
drainage pipes |
expanded polystyrene
beads |
lightweight |
packaging |
vacuum formed |
sheets |
buoyant |
swimming floats |
thermal properties |
blocks |
tough |
cups |
difficult to recycle when it is dirty |
0.96-1.04 g/cm3 |
fragile |
sound-heat insulation |
| |
|
beads in bean bags |
|
|
ABS
granules |
high impact strength |
computer casings |
excellent impact strength |
tube |
lightweight |
mobile phones |
wide range of techniques |
sheet |
hard, durable |
safety helmets |
coloured using pigments |
1.0-1.05 g/cm3 |
|
car bumpers |
more expensive |
fluoroelastomer
sheet |
heat |
rubber |
tube |
chemical |
gloves |
1.8 g/cm3 |
solvent resistant |
Urethane/polyurethane
liquid |
high load resistance |
bags |
thin sheets ->carrier bags |
sheet |
wear resistant |
varnish |
charge on carrier bags |
granules |
flexible |
wheels |
foam |
electrical resistance |
furniture foam |
1.2 g/cm3 |
|
|
styrofoam
sheet |
lightweight |
fast-food packaging |
easily formed -school equipment |
0.05 g/cm3 |
buoyant |
audio visual equipment packaging |
hot wire requires good ventilation |
| |
heat insulation |
| |
easily shaped |
Rigid/high-density polystyrene
granules |
lightweight |
food packaging |
easily recyclable |
sheets |
food safe |
|
difficult to be recycled if dirty |
wide range of colours |
heat safe |
PET
granules |
lightweight |
food packaging |
excellent visual clarity |
sheet |
strong |
bottles |
pigments |
1.38 g/cm3 |
food safe |
electronic components coating |
|
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