Q. Plastic that softens when heated but firmly solidifies when cooled called?
Solution:
Thermosetting plastic – A plastic that softens when heated but firmly solidifies when cooled. Once solidified, they cannot be heated and deformed again.
This is because monomer units have a cross-linking polymer that, when heated, undergoes physical as well as chemical reactions.
E.g. Bakelite – used in the manufacture of plugs, switches, buttons, electrical and cooking utensil handles, etc.
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