UNIT 3                       PLASTICS. 3D PRINTING.


PLASTICS  enlace al blog petervaldivia

Most plastics are made from oil. Plastics are man-made materials. They are a useful invention because they are waterproof, easy to shape and tough. They have taken the place of traditional materials like wood and metal in many products. It is bad to waste plastic, as it is made from non-renewable resources and takes a very long time to decay.

CHARACTERISTICS OF PLASTICS

• They are relatively cheap.

• Most plastics are synthetics and are made from oil.

• Plastics are good insulators which makes them safe to use for casing electrical equipment and for the covering on wires.

• They are waterproof.

• They are light.

• Most plastics can be made in different colours or can be clear.

• Plastics are non-corrosive and non-toxic

• They wash well

• They are not biodegradable and cannot be easily recycled.

EXAMPLES OF PLASTICS

Examples of plastic include PVC, acrylic, polystyrene, expanded polystyrene , man-made rubber, polythene (or polyethylene, or PET) and nylon

TYPES OF PLASTICS

1. Thermoplastics- termoplásticos
2. thermosetting- termoestables
3. elastomers- elastómeros

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