Perlite in a vacuum provides good heat insulation as is required for the the components in the SHE.

It minimizes conducted and radiated heat loss.

A further relevant point is that some Caribbean Islands, who do not have very much of other minerals, have a supply of perlite.

It is not documented that Africa has a large supply of perlite, therefore low income Caribbean Islands with perlite reserves would have a start up mineral  resource that could benefit a budding African industrial economy.

At the time of this statement, perlite is cheap and easy to handle.

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