Low-Density Polyethylene (LDPE):
- o Plastic cling wrap/food packaging; because it is tough, flexible, transparent, non-toxic. As LDPE
- is permeable to O2 and CO2 but not to water these films keep foods fresh and prevent them from drying out.
o Disposable shopping bags; because it is cheap and relatively strong
o Milk bottles; as it is non-toxic, cheap, un-reactive and recyclable
o Insulation of wire and cables: non-conductor, reasonably strong
High-Density Polyethylene (HDPE):
o Kitchen utensils and containers; as it is strong and non-toxic
o Containers for petrol, oil, detergents, acids and solvents: chemical resistance, strong
o Rubbish bins; it is rigid, only slightly flexible and hard
o Pipes and other building materials; it is rigid, hard, and un-reactive
o Children’s toys, plastic buckets, lunch boxes and playground equipment: durable and tough
o Can be made into tough films, i.e. freezer bags.
Polyvinyl Chloride (PVC):
o Pure PVE is not a useful plastic as it is hard and very brittle and tends to decompose when heated; however, the inclusion of other additives to improve its flexibility and thermal stability greatly extended its range of uses.
o Garden hoses; it can contain UV inhibitors; it is relatively un-reactive, flexible, and durable. Can be softened with plasticisers.
o Pipes and guttering; it is very rigid and hard, and un-reactive. It is also easily shaped.
o Building industry for external cladding, guttering and down pipes, electrical conduit, waste water pipes, rigid panels and floor tiles: ridgid, hard, un-reactive, easily shaped
o Kitchen utensils, credit cards: strong, non-toxic
o Upholstery coverings for cars and furnishings, electrical insulation and garden hoses: can be made flexible
- o Bottles: impervious to oils and most
- organic materials
o CD cases, cassette tapes; used because polystyrene is transparent, brittle, hard, rigid, easily shaped, and is a good insulator.
o Screw driver handles and kitchen cupboard handles; very durable and strong, hard and inflexible.
o Using different production techniques can be used to produce products including computer and TV cabinets, wall tiles and study furniture.
o Packaging, and disposable cups; it is light (full of air), cheap, and it is a thermal insulator
o Boogie boards and the cores of surfboards: lightweight, cheap, low density
o Sound-proofing; it is a shock absorbent material, light, easily shaped, excellent insulator