Duplex board-it is used for mainly liquids as it may have a water-proof liner, also has a wax feel on out side.
Corrugated board-used for bigger things like TV's this is used becauses it is strong it has a top and bottom layer of card with a triangulated section in the middle.
European Standards -
This is used to print on things like card and paper used in big factorys because it is fast and effective.
Types of plastic
Polyethylene Terephthalate =PET - this is used for bottled water
Polystyrene= PS - this is used for plastic cutlery, packaging of electronic goods and yoghurt pots
Low Density Polyethylene=LDPE -bin bags, shopping bags and film packaging