Insulators can be classified by what they resist such as heat, electricity, or sound. Glass wool is a popular thermal insulator in buildings.
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Insulator Materials
Common insulating materials include rubber, plastic, glass, and wood. The plastic coating on wires acts as an electrical insulator.
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Insulation Effectiveness
The effectiveness of an insulator is measured by its ability to resist the transfer of a particular form of energy. A double glazed window is a more effective sound insulator than a single pane.