"Steve.T" wrote:

The composite materials are used as insulation in certain cases. Think
of fiberglass.

Fiberglass, in and of itself, is not a particularly good insulator. When it's
spun into a sort of glass wool and traps a lot of small air bubbles, that
changes. The air *is* a good insulator.

George Patterson
He who would distinguish what is true from what is false must have an
adequate understanding of truth and falsehood.