Hi Jim

You bring up a great point.  As an experimental, there are no requirement for
materials to be cert'd to FAR 25.853 (flammability).  All of the materials I
am putting in Dave Morss' Legacy however, meet flammability.  As you say Jim,
it's something that everyone should insist on.

Interestingly, I worked at trying to convince a major bus company of the need
for flammabilty resistance for their insulation and they were not interested.
 They use ordinary bead foam that burns a bit like gasoline.  True, there are
few instances of fatalities in busses burning but most other companies are
moving toward flame resistance.  As for large commercial aircraft, an AD is
pending that will make fire hardening of fuselages even more strict and will
require burn-through protection 4years from when it is adopted, and 2 years for the
stricter cabin fire standards.