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Rubber and wood are good electrical insulators because they don't let electricity pass through them.The best insulators in the world are uranium hexafluoride - used as the dielectric in UHV machines and also Barium Titanate [BaTiO(4)]

Better to say that they resist the flow of charge - rather than 'don't let electricity flow through them'.

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Marilyne Corwin

Lvl 10
3y ago

What else can I help you with?