Patent ID: 7399719

Claim:
An apparatus comprising: a very low-k shell having an interior cavity and an exterior surface; wherein the shell comprises an alumina-silica ceramic fiber based material loaded with a second material comprising at least 0.1 percent by weight of carbon, and is also loaded with at least five percent by weight of the second material, further comprising Mg(OH)2 and/or Ca(OH)2 which endothermically decomposes above a pre-determined temperature T degrees Celsius where T is greater than 150 and less than 500; an electronic device enclosed within the interior cavity of the shell; and a first energy conduit extending between the interior cavity and the exterior surface, the energy conduit comprising a segment within a wall of the shell; wherein the segment of the first energy conduit within a wall of the shell changes at or after a time when a threshold temperature is met or exceeded in a manner that causes the thermal conductivity of the segment to decrease.