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Usually nonmetals. Rubber, plastic, wood, cloth, paper, Styrofoam, tinfoil (to reflect the heat.)
The most common insulator for electricity is plastic.

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Wiki User

13y ago
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Wiki User

12y ago

The best thermal insulator is a vacuum, but rubber, nylon, plastic, wood, and cloth also work. Also, gasses are the worst conductors of heat.

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Wiki User

9y ago

There are a number of materials that make good thermal insulators. Blankets and pockets of air make good thermal insulators for example.

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Wiki User

9y ago

The best insulators are made out of materials that are not good conductors. This is why foam substances and cotton fabrics are good insulators.

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9y ago

The materials which are the best insulators are ones that do not conduct heat. The common insulators are made from rubber and other plastics.

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Wiki User

15y ago

The best insulator of heat is probably polystyrene foam or fiber glass.

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Wiki User

6y ago

styrofoam! is good. Rubber or most plastics.

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Wiki User

11y ago

your butt!

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StudyAtom

Lvl 4
2y ago

Plastics and rubber

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Q: What substances are the best insulators?
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