While it is true that perlite concrete will insulate more than regular concrete, in practice you will find that perlite concrete will retain heat and offer more thermal mass than it will practical insulation.

Is perlite a good insulator?

The United States is the world’s largest producer and consumer of perlite. … In addition to its use as an insulator in buildings, perlite is used for the insulation of low-temperature equipment, such as super-cold storage and cryogenic tanks, as well as in food-processing applications.

How much heat can perlite take?

Perlite particles are extremely lightweight, frothy mineral bubble clusters that are readily compatible with cementitious and other SFRM formulations. Having been flash-expanded from its graded, raw ore form at high temperature, perlite can withstand temperatures from 1600 to 2000ºF before reaching its softening point.