The shells of household appliances are mostly insulators. Power cords are all external insulators, and rubber is the most commonly used one. Inside is a conductor, the most commonly used is copper wire.

Why are you doing this? This problem, er ... Conductors are used to conduct electricity, connect the power supply and electrical appliances, and thus play the role of electrical appliances. Insulators are used for safety and to prevent the danger of electric shock.

Nothing in household appliances is made of pure insulators or conductors. Pure insulators cannot be called electrical appliances.