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Density vs Thermal conductivity for: 1- polystyrene foams, 2- rock wool [41], 3- cork board, 4- foamed concrete, 5- aerated concrete, 6- fired bricks, 7- lime sand bricks, 8- lightweight concrete, 9- concrete hollow bricks [42], 10- [20], 11- [24], 12- [26], 13- [21], 14- [43] ★- S2.5 sintered at 800 °C.
