A plastic used for making crockery is:

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Solution

A plastic used for making crockery is melamine-formaldehyde polymer.
It is also known as melmac.
This type of plastic does not break even when they fall down i.e.; they are unbreakable.
It is a copolymer.
Copolymer: A polymer in which 2 different monomer units are polymerise to form a polymer.
Example: Melamine plastic, monomer units are Melamine (2, 4, 6-Triamino-1, 3, 5- triazine) and Formaldehyde (HCHO)
Structure of melamine-formaldehyde plastic is shown below.

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