The HDT of Jeffco the resin we're using is 190 degrees but that is probably
about 10-20 degrees above what the glass transition temperature is.  The
strength wand modulus will drop off pretty quickly as the heat gets above the
HDT.

The core of our birds are quite resistant to flame since phenolics are
inherantly very good as flame barriers, however this is negated largely due
to their very low mass and their open cells.  You can get structural phenolic
core with phenolic face panels.  It's used a lot in the airlines for interior
panels which must meet FAR 25.853 (?) which dictates flammability standards
to section 121 operators, (commercial aircraft) for interior components.  I
have a buch of the panel around which isn't as good as epoxy but not too bad
either.

Dan Newland