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It isn't. When in contact it has a high transfer rate. It is a decent reflector though, which in some cases can be used for insulating purposes..

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Q: Why is aluminum foil a good insulator?
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Related questions

Why is tinfoil a good insulator?

It actually isn't a good insulator. Tin foil and aluminum are good conductors, not insulators.


Is aluminum foil a conductor or insulator?

Insulator or conductor depending on the circumstances. Aluminum foil conducts heat, but it cuts off air flow and reduces evaporation of fluids. Aluminum foil reflects and thus minimizes radiation transmission. With foods it is more useful as an insulator. It also acts as an insulator on windows. But, aluminum is definitely a good heat conductor.


Is tin foil a good insulator?

What we usually refer to as tin foil is almost always aluminum foil. Aluminum is a very good conductor of heat, and aluminum foil makes a very poor insulator. The exception might be in the case of radiant energy, which it reflects well, and even better when it is polished.


Is cotton a better insulator than aluminium foil and tissue paper?

No, cotton is not a better insulator than aluminum foil and tissue paper. Aluminum foil is a good insulator as it reflects heat, while tissue paper acts as a thermal barrier. Cotton, on the other hand, is not as effective of an insulator because it does not have the same reflective or thermal barrier properties.


How do the different types of insulators affect the temperature of the can Out of Steel Wool Aluminum Foil Cotton and Bubble Wrap which one would be the best insulator?

If I had to choose the best insulator out of steel wool, aluminum foil, cotton and bubble wrap, I would choose the aluminum foil.


Why is foil a good insulator?

Foil is considered to be a good insulator since it has the ability to reflect radiation. However, aluminium foil is commonly used as a conductor and not an insulator.


Can aluminum foil be used under laminate flooring to act as an insulator?

yes


Is aluminum foil the best insulator?

yes it is because it traps the coolness inside.


Is aluminium foil a good electrical insulator?

No, like many metals, aluminum conducts electricity. Better use rubber or plastic.


Which material makes a better heat insulator newspaper or aluminum foil?

Aluminum foil is a better heat insulator than newspaper. Aluminum foil reflects thermal energy, while newspaper absorbs and conducts heat. Therefore, aluminum foil will help keep heat in or out more effectively.


Is foil a good insulator?

yes


Name a material that is a good insulator?

Foil