IPAC @ LLNL - Technology Profile: Thermal Properties of Aerogels

IPAC @ LLNL - Technology Profile: Thermal Properties of Aerogels: "Silica aerogels at 300 K and 1 atm have measured conductivities as low as 0.020 W/m�K (an R per inch value of about 7).
Organic aerogels have thermal conductivities of 0.012 W/m�K (an R per inch value of 12).
Carbon particle-loaded (opacified) silica aerogels have thermal conductivities of 0.013 W/m�K (an R per inch value of 11). "