The Thermal insulation value for a material is its ability to resist the flow of heat across it. The measure of this heat flow rate is known as a materials K value and the lower this value the higher the products thermal efficiency.
The table below shows that broadly speaking the K value for foamed concrete lies between 0.08w/mk at the lower densities and 0.62w/mk at the higher densities.
400 600 800 1000 1200 1400 1600
0.08 0.1 0.14 0.22 0.35 0.5 0.62