Solve any question of Electric Charges and Fields with-. Some common insulator materials are glass plastic rubber air and wood. Conductors And Insulators Webquest And Simulation Middle School Science Resources Teaching Middle School Science Science Teaching Resources An electrical insulator is a material that does not easily allow flow of electricity through an electric current. . Clearly insulators are said to have high resistivity to the flow of electric current. Is iron a conductor or an insulator. Plastic Sheet or Tube Glass. Aluminum copper and silver are all good conductors of electricity. What materials are the best insulators. Non-metals are the materials which have entirely different properties than. A light bulb filament. 29 Which of the following material is NOT a good insulator. As rubber is the only non-metal on the list so it is an electrical insulator. Which of the following...