Plastics are those artificial materials with macromolecular structure that under certain conditions of temperature and pressure undergo permanent changes in shape.
They are divided into thermoplastics, thermosets and elastomers.
Plastics are obtained from petroleum.
The advantages of plastics, compared to metals or other materials, are that they are easier to manufacture, to colour, they are economical, they provide sound, thermal, electrical, mechanical (vibration) insulation; they have a high resistance to corrosion and chemicals. They are water-repellent and at the same time fungus and bacteria-proof.