what are switch boards made up ?
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In previous era switches and switchboards were made up of wood but now they are made up of THERMO-SETTING PLASTICS
Ashish1111dav:
what are thermosetting plastics ?
Thermoset, or thermosetting, plastics are synthetic materials that strengthen during being heated, but cannot be successfully remolded or reheated after their initial heat-forming
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They are made up of thermo setting plastics
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