ABSTRACT
Development of fire and heat shield materials with reduced combustibility consists of several stages. Erosion behavior of such composites in oxygen-acetylene flame is better than of graphite, but this was not confirmed by tests in a high-rate flux. Phosphorus-carbonized material possesses fire shield properties under the following conditions: it should coat completely the unchanged protected polymer and possess strength providing mechanical resistance of the cover formed. Tests on linear pyrolysis of samples from poly(methyl methacrylate) covered by plates from porous thermoresistant material show that increase of protecting plate thickness at the same heat effect induces surface temperature increase and changes the level height of liquid degradation products in the foam material. If polymer melting temperature is low, and the melt is of low viscosity, or liquid products are easily formed during pyrolysis, then coke formed on the surface cannot be the effective protection from fire.
