Two intumescent fire resistant materials were characterized. The therm
ophysical properties--mass loss, rate of mass loss, specific heat, the
rmal conductivity, thermochemical expansion, permeability, and porosit
y--of Firex RX-2390 and No Fire Formula A were characterized as a func
tion of temperature. Correlation models were derived from the data. Pr
operties of the two materials were compared and related to their therm
al performance.