Medium
Example of thermosetting plastic is -
Explanation
Explanation
Thermosetting plastics harden permanently once moulded and cannot be melted and reshaped again — Melamine (used in kitchenware) is a classic example. P.V.C., Polythene, and P.E.T. are thermoplastics, which can be melted and remoulded repeatedly. So the correct answer is Melamine, option (1).
PRO TIP
Re-check your working by substituting the answer back into the original question.