"It's better to die on your feet than to live on your knees"

This material is also known as H+H,Y TONG,Greisl,Hebel, Porit and Hansa Damapor.Just Google autoclave concrete and go to wikipedia.
Interestingly the English version has a note saying the neutrality of this article is disputed.When I switched to German it gave a much more informative description of this material that I knew earlier as Gas beton.On its advantages it states good insulation,easy to handle and transport.Disadvantages poor sound proofing it has a tendency to wick water and to retain it.This goes along with my own experiences with this material.To describe it as concrete is really not telling the truth its make up is chalk cement and quartz sand.
Hope this helps you Billy