According to Mil-I-24768, G-10 is equivalent (ie is the industry
designation) for the military designation GEE, FR-4 is the industry
equivalent of military designation GEE-F;  GEE & GEE-F are both described as
"Electrical grade glass fabric base, epoxy resin" except that GEE-F is also
flame resistant.  Depending on your application, the two may or may not be
interchangable, but they are not identical.

Sheila Smith
Tracor Aerospace Electronic Systems

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