Page 35 - Genius Kidz Prudence Learning Sc-8
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On cooling, it freezes to a brittle and
glassy state.
It has high molecular weight.
It is used for manufacturing toys,
bottles, carpets, etc. Thermoplastic
(ii) Thermosetting plastic :
It does not melt on its exposure to heat.
It can't be remoulded.
It is stronger as compared to
thermoplastics.
Thermosetting plastic
It is used for making electric switches
and plugs.
Different types of plastics, their properties and uses :
Plastic Monomeric Unit Type Uses
(1) Poly Vinyl Chloride Vinyl chloride Thermoplastic It is used for
(PVC) making rain coats,
soles of shoes, hand
bags, water pipes,
water tanks, etc.
(2) Polyethylene Ethylene Thermoplastic Kitchen and laboratory
(PE) (CH == CH 2) ware, anti-corrosion
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coating, etc.
(3) Polypropylene Propylene Thermoplastic Car bumpers, food
(PP) (CH == C== C==CH 2) containers, etc.
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(4) Polystyrene or Light weight polymer Thermoplastic Packaging of cell-
polythene phones and TV,
(PS) (Formula) insulating
refrigerators, etc.
(5) Teflon or polytetra- Tetrafluoroethene Thermoplastic Used for making
fluoro ethylene molecules non-stick kitchen
(PTFE) wares, lubricants, etc.
(6) Melamine Thermosetting Crockery, table
formldehyde (MF) tops, etc.
(7) Bakelite (phenol Thermosetting Plugs, switch boards,
formaldehyde) insulation material,
etc.
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