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PLASTICS:Plastics are materials formed by polymers. The polymers in…
PLASTICS:Plastics are materials formed by polymers. The polymers in plastics are
made from long chains of carbon atoms.
Origin
Natural plastics are obtained directly from raw vegetable matenals
— for example, cellulose or latex, or from animal proteins. 
Synthetic plastics are made from compoumds extracted from petroleum, natural gas and carbon The majority of plastics belong to this group.
Properties
Common
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Other properties: low density, impermeability
Mechanical: malleability, ductility, mechanical resistance.
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Classification of plastic
Thermoplastics:We manufacture thermoplastics from compounds adquired from. They' re made up of weakly formed molecular chains.
Thermostable plastics:These plastics are made from compounds derivated from petroleum.They are formed by strongly-linked
chams runmng in different directions
Elastomers:Made by vulcanisationi mixing sulphur and rubber, and heating to 160ºC.They are hard, resistant and very elastic — stretching easily under
force.
Formation techniques
Lamination:
Thermoplastic produced by the extrusion method ls passed through a series of hot cylinders to produce sheets of varying thickness.With this technique, we can produce different finishes.
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