Unit 2 Materials and Components - Polymers - Thermoplastics Flashcards
What are the properties of acrylic?
- stiff
- hard
- durable
- easily scratched
- good electrical insulator
What are the disadvantages of acrylic?
- brittle
- can break
- scratches easily
- splinters easily
What are the applications of acrylic?
- lighting
- CD cases
- car lighting
- baths
What are the different types of polyethylene?
- HDPE
- LDPE
- PET
What are the properties of HDPE (high density polyethylene)?
- good electrical insulator
- chemical resistant
- impact resistant
- flexible
What are the disadvantages of HDPE (high density polyethylene)?
- colour tends to fade over time
- can break under stress
What are the applications of HDPE (high density polyethylene)?
- water tanks
- water pipes
- buckets
- bowls
What are the properties of LDPE (low density polyethylene)?
- good electrical insulator
- chemical resistant
- flexible
What are the disadvantages of LDPE (low density polyethylene)?
- colour tends to fade over time
- can break under stress
What are the applications of LDPE (low density polyethylene)?
- washing up liquid bottles
- dustbin sacks/bags
- cable insulation
- packaging film
What are the properties of PET (polyethylene terephthalate)?
- good alcohol and oil barrier
- chemical resistant
- high impact resistance
- high tensile strength
What are the disadvantages of PET (polyethylene terephthalate)?
- can discolour
- when use in containers for food stuffs, it needs to be treated to prevent taste problems
What are the applications of PET (polyethylene terephthalate)?
- fizzy drink bottles
What are the properties of PVC (polyvinyl chloride)?
- good chemical resistance
- weather resistant
- stiff, tough, hard, lightweight
What are the disadvantages of PVC (polyvinyl chloride)?
- can become brittle over time
- ultraviolet light causes brittleness
What are the applications of PVC (polyvinyl chloride)?
- electrical wiring insulation
- pipes for guttering
floor covering
What are the properties of PP (polypropylene)?
- light, hard, impact resistant
- chemical resistant
What are the disadvantages of PP (polypropylene)?
- ultraviolet light causes degradation
- oxidation can be a problem during manufacturing process
What are the applications of PP (polypropylene)?
- medical syringes
- carpets
- kitchenware
What are the properties of PS (polystyrene)?
compressed:
- light, hard, stiff, brittle, low impact strength
expanded:
- buoyant, lightweight, good insulator
What are the disadvantages of PS (polystyrene)?
compressed:
- weak, ignites easily
expanded:
- crumbles and breaks, easily ignites
What are the applications of PS (polystyrene)?
compressed:
- CD cases
- refrigerator linings
- water tanks
expanded:
- packaging
- insulation
- displays
What are the properties of ABS (acrylonitrile butadiene styrene)?
- chemical resistant
- hard
- tough
What are the disadvantages of ABS (acrylonitrile butadiene styrene)?
- UV light causes degradation
What are the applications of ABS (acrylonitrile butadiene styrene)?
- mobile phones
- safety helmets