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Most materials can be neatly classified as conductors or non-conductors. Conductors are generally metals, with copper and aluminum being the most common metals used to produce wire that is used to intentionally conduct electricity. The iron, steel, and brass used to manufacture electrical equipment and hand tools are also excellent conductors.
Non-conductive materials are generally compounds containing carbon and hydrogen. These include rubber, wood, and plastics. Silica-based materials like ceramics and glass are also non-conductive. One common substance, water, falls roughly between the conductor and non-conductor status. It is not a good conductor, but water, especially if it has impurities such as sea water, is a good enough conductor to create safety concerns in some situations.