“…For examining the upward fire propagation behavior of polymers, theoretical expression for the flame spread velocity [11,16,17,18] was utilized. With an assumption that the forward heat transfer from the leading edge of the flame is proportional to .QI 5 Ê o F M R' I I "H 2 (Q/w) n , flame spread theories [11,16,17,18] suggest the following expression for the upward fire propagation velocity: , 1/2 X (Q r /w) n /(T ig -T a )(kpc p ) 1 /2 (5) Based on the correlation between small-scale and large-scale upward fire propagation experiments, Eq 5 is modified as follows [19,20,21 …”