There's a wonderful video posted on YouTube of a demonstrator taking a gas torch to a penny that sits on a chunk of Air Krete [source: YouTube]. The penny melts, but the Air Krete appears completely unaffected.
To prove the material's fireproof qualities, a contributor to a green design forum described how, after he started a fire in the living quarters he had built in an old barn, the fire completely gutted the living space. But that's where it stopped. The living quarters were insulated with Air Krete, which the local fire department credited with blocking the fire's spread to the barn structure [source: Air Krete].