The MAIN raw material to make plastics is....?
carbon
oil, petroleum
cellulose
Which of the following is/are the reasons of using plastics?
They are cheap
They can be moulded into different shapes easily
They are very heavy
Which of the following statements about plastics is correct?
There are no cross-links between polymer chains in thermosetting plastics
Thermoplastics are biodegradable
Polyester is a thermoplastic that is usually used to make shirts
Compression moulding is usually used to mould thermoplastics
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