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Jan8-13, 08:33 AM
P: 11,900
That foil gives results not far away from a perfect black body with perfect heat conduction inside. Thermal radiation is proportional to T^4, and if you calculate the average T^4 between heat source and cold environment you end up with a value close to the temperature of your foil. It is a bit better, indicating reflection of parts of the radiation.
The isolation quality will depend on the absolute temperature itself, but if you know the environment of the foil, you could use this blackbody radiation to get a value of m^2K/W.