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What are thermosetting plastics?
Thermosetting plastics are those plastics, which can be only moulded for once. They cannot be reshaped or reused because they do not get softened on heating. Bakelite, melamine etc. are examples of thermosetting plastics.
Explain why the following are made of thermosetting plastics.
(a) Saucepan handles
(b) Electric plugs/switches/plug boards
Categorise the materials of the following products into ‘can be recycled’
and ‘cannot be recycled’:
Telephone instruments, plastic toys, cooker handles, carry bags, ball point
pens, plastic bowls, plastic covering on electrical wires, plastic chairs,
electrical switches.
Rana wants to buy shirts for summer. Should he buy cotton shirts or
shirts made from synthetic material? Advise Rana, giving your reason.
Give examples to show that plastics are noncorrosive in nature.
Should the handle and bristles of a tooth brush be made of the same material? Explain your answer.
‘Avoid plastics as far as possible’. Comment on this advice.
Match the following of column I correctly with the phrases given in column II:
‘Manufacturing synthetic fibres is actually helping conservation of forests’.
Comment.
Describe an activity to show that thermoplastic is a poor conductor of electricity.
What are natural fibres?
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