![]() Some materials such as glass, paper and Teflon, which have high resistivity, are very good electrical insulators. This is known as the breakdown voltage of an insulator. In addition, all insulators become electrically conductive when a sufficiently large voltage is applied that the electric field tears electrons away from the atoms. ![]() A perfect insulator does not exist, because even insulators contain small numbers of mobile charges (charge carriers) which can carry current. The property that distinguishes an insulator is its resistivity insulators have higher resistivity than semiconductors or conductors. This contrasts with other materials, semiconductors and conductors, which conduct electric current more easily. New Business License Listings Fresno Ca Airport. For insulation of heat, see Thermal insulation. This article is about electrical insulation.
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