Organic insulation materials are widely used in the external wall insulation system of high-rise buildings

but it also increases the risk of external wall fire.This paper

based on computer simulation

focuses attention mainly on the fire spread rate

mass loss rate

temperature distribution and other characteristics of one of the insulation materials Expanded Polystyrene（EPS）.The study found that after the ignition of the external insulation material

in a very short period of time

fire spreads to the entire surface from bottom up

and has a feature of skin burning.Upward fire spread dominates before it reached the top of the material.The central region of the material was remarkably burned off.While the upper ends of the material continued to burn

accelerating the trend of downwards spread

then fire spreads downwards intensely along the middle of inside material and materials burned into a V-shape until extinguished.The burning rate curve is similar under different ignition points as to the fire spread of external insulation materials in high-rise building

forming two peaks.