Question

graphite is use as insulators
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Answer 1

Graphite is an interesting material, an allotrope of carbon (as is diamond). It displays properties of both metals, and nonmetals. However, like a metal, graphite is a very good conductor of electricity due to the mobility of the electrons in its outer valence

Answer 2

Thus diamond is an insulator/dielectric. Graphite: covalent structure, with each carbon bonded to three other carbon atoms in a hexagonal arrangement. Three out of four valence electrons are used for covalent bonding with other carbon atoms. ... Thus, graphite is a good conductor.