diapers are good insulators because they hold in the cold and and heat but is a bad conductor
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Yes they are.
The rails are good conductors The wooden ties they rest on are insulators
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A material or an object that does not easily allow heat, electricity, light, or sound to pass through it. Air, cloth and rubber are good electrical insulators; feathers and wool make good thermal insulators.
Usually nonmetals. Rubber, plastic, wood, cloth, paper, Styrofoam, tinfoil (to reflect the heat.)The most common insulator for electricity is plastic.