Thermosetting and Thermoplastic

Concept Explanation

Thermosetting and Thermoplastic

Material which can be easily moulded into any desired shape on heating is called a ‘plastic’. Plastics are synthetic (man – made) polymers. Plastics form an important class of synthetic materials. In plastics, the arrangement of the individual units may be linear or cross-linked.

There are Basically Two Types of Plastics :

  • Thermoplastic 
  • Thermosetting plastic
  •                     Thermoplastics

                 Thermosetting plastics

           1  Thermoplastics are long chain polymers with no cross linking. Heating also does not produce any cross linking between the chains.

           1.Thermosetting plastics are the polymers in which chains get highly cross lined on heating.

           2.  Thermoplastics can be melted by heating and thereafter moulded into desired Shapes. This is a reversible process.

            2.    Unlike thermoplastics, thermosetting plastics cannot be remoulded after reheating.

     3.  PVC (Polyvinyl chloride) and LDPE (low-density polyethylene) are examples of thermoplastics. 

     3.  Melamine and Bakelite are example of             thermosetting plastics.


    Sample Questions
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    Question : 1

     PVC (Polyvinyl chloride) and LDPE (low-density polyethylene) are examples of _______________________ .

    Right Option : B
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    Question : 2

    Which of the following statements is true for thermoplastic and thermosetting plastic?

    Right Option : C
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    Question : 3

    Each of these questions contains an Assertion followed by Reason. Read them carefully and answer the question on the basis of following options. You have to select the one that best describes the two statements.

    Assertion : Handles of utensils are made up of thermoplastics.

    Reason : Thermoplastics get soften on heating.

    Right Option : D
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