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1 mark

There are some plastics which when moulded once, cannot be softened by heating. These are called:

  1. A
    Polyvinyl Chloride
  2. B
    High-density polyethene (HDPE)
  3. C
    Thermoplastic Polyurethanes (TPU)
  4. D
    Thermosetting plastics

Solution & Step-by-step Explanation

Thermosetting plastics are polymers that cross-link together during the molding process to form a permanent, rigid chemical structure. Once molded and set, they undergo a chemical change and cannot be softened or remolded by heating. Examples include bakelite and melamine.

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There are some plastics which when moulded once, cannot be softened by heating. These are called:
A
Polyvinyl Chloride
B
High-density polyethene (HDPE)
C
Thermoplastic Polyurethanes (TPU)
D
Thermosetting plastics

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ScienceChemistryPolymers and Plastics

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