Types of plastic

There are about 50 different groups of plastics, with hundreds of different varieties. All types of plastic are recyclable. To make sorting and thus recycling easier, the American Society of Plastics Industry developed a standard marking code to help consumers identify and sort the main types of plastic. These types and their most common uses are:

	PET	Polyethylene terephthalate - Fizzy drink bottles and oven-ready meal trays.
	HDPE	High-density polyethylene - Bottles for milk and washing-up liquids.
	PVC	Polyvinyl chloride - Food trays, cling film, bottles for squash, mineral water and shampoo.
	LDPE	Low density polyethylene - Carrier bags and bin liners.
	PP	Polypropylene - Margarine tubs, microwaveable meal trays.
	PS	Polystyrene - Yoghurt pots, foam meat or fish trays, hamburger boxes and egg cartons, vending cups, plastic cutlery, protective packaging for electronic goods and toys.
	OTHER	Any other plastics that do not fall into any of the above categories. - An example is melamine, which is often used in plastic plates and cups.

Benefits of plastics

The considerable growth in plastic use is due to the beneficial properties of plastics. These include:

• Extreme versatility and ability to be tailored to meet very specific technical needs.
• Lighter weight than competing materials, reducing fuel consumption during transportation.
• Extreme durability.
• Resistance to chemicals, water and impact.
• Good safety and hygiene properties for food packaging.
• Excellent thermal and electrical insulation properties.
• Relatively inexpensive to produce.