Non-flammable, fibrous-siloxane cured composites derived from the
polymerization of dialkoxysilanes, trialkoxysilanes and
tetraalkoxysilanes, in an aqueous medium, to obtain viscous polysiloxane
resins. These siloxane resins are used to impregnate or coat various
fibrous materials such as carbon fibers or glass cloth which are
subsequently subjected to heat and pressure to form cured, non-flammable
siloxane-impregnated composites e.g. panels having a density of about 1 to
3 g/cc. and a limited oxygen index above 30. These non-flammable,
fibrous-siloxane composites are particularly useful in the manufacture of
fire-proof materials for various transportation vehicles and for building
materials e.g. panels as a fire barrier.