"Christopher Brian Colohan" wrote

My understanding is that fire safes are designed to protect documents.
They are lined with a chemical which produces water when it is heated,
which stops documents from lighting on fire. Water probably won't do
a lot of good for electronics.

Lining produces water? Where did you hear that poppycock?

They insulate, plain and simple, to keep the document below ignition
temperature.
--
Jim in NC