(C) Thermosetting plastics are polymers that become hard and infusible on heating and cannot be remolded. $Bakelite$ (phenol-formaldehyde resin) is a

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(C) Thermosetting plastics are polymers that become hard and infusible on heating and cannot be remolded. $Bakelite$ (phenol-formaldehyde resin) is a classic example of a thermosetting plastic. $PVC$,$PVA$,and $Perspex$ are thermoplastic polymers that soften upon heating and can be reshaped.