Aerodynamic heating during reentry would push the temperature well above this level in areas, so an effective insulator was needed.

So it can be an effective insulator or nuclear reaction moderator.

The meringue is an effective insulator, and the short cooking time prevents the heat from getting through to the ice cream.

It's possible that engineers will discover a way to create an effective insulator even at a thickness of one nanometer.

Geofoam is 98% air by volume, making it an effective thermal insulator.

Studies have shown that milkweed is actually a more effective insulator than goose down.

The thatch is also a highly effective insulator.

Diamonds are very effective electrical insulators, but also very good conductors of heat.

It is an effective insulator and uses far less energy to produce than concrete or steel.

The sonic fold was a most effective insulator.