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3. Polystyrene. 
Polystyrene is a thermoplastic produced by the polymerization of styrene. The electrical insulating 
properties of polystyrene are outstandingly good and it is relatively unaffected by water. Typical applications 
include light fixtures, toys, bottles, lenses, capacitor dielectrics, medical syringes, and light-duty industrial 
components. Extruded sheets of polystyrene are widely used for packaging, envelope windows, and 
photographic film. Its resistance to impact can be improved by the addition of rubber modifiers. Polystyrene can 

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be readily foamed; the resulting foamed polystyrene is used extensively for packaging. 
4. Polythene (polyethene, polyethylene)
Polythene (polyethene, polyethylene) is a plastic made from ethane. It is one of the most widely used 
important thermoplastic polymers. It was first developed by the polymerization of ethane at a pressure of 2,000 bar 
at 200°C. This produced low-density polythene (LDPE). A relatively high-density form (HDPE) was synthesized in 
the 1950s using a complex catalyst. Polythene is a white waxy solid with very low density, reasonable strength 
and toughness, but low stiffness. It is easily moulded and has a wide range of uses in containers, packaging, 
pipes, coatings, and insulation. 
Vocabulary: 
adhesion 
— прилипание 
adhesive 
— клей 
bond 
— связи, узы 
insulation 
— изоляция 
casting 
— литье 
void 
— пустота 
solid
— твердое тело, твердый 
acid 
— кислота 
alkali 
— щелочь 
to obtain 
— доставать, получать