Abstract
Analysis on the process of smoke-evolution and evolution-rate induced by thermal decomposition of respective samples at various temperatures have been pursued in terms of dissymmetry factor (Z-value) measurement in light-scattering technique.
The Z-value of some Organic building materials in each temperature were measured by light-scattering method.
Size distribution of smoke in respective systems has been estimated with the aid of ROYCO Particle Counter concerning plastics and woods. The results agrees with ones obtained from Z-data based on light scattering technique and those results obtained from photographic observation by electron microscope.
Estimation on the smoke-evolution rate induced by the thermal decomposition in the controlled stationary electrical furnace from 350°C to 650°C have been pursued in terms of turbidity measurement and 90° angular scattering technique concerning respective samples.
The apparent activation energies concerning the evolution of smoke have been obtained by the Arrhenius-type plots on the evolution rate of smoke (k) v.s (1/T).
The reduced activation energies concerning the evolution of smoke have been obtained from the plots of (ΔH/Po2) v.s Po2.
Characterization on the mode of evolution of smoke for organic internal building materials have been pursued successfully in terms of the reduced activation energies for the initial stage of fire in the temperature range from 400°C to 550°C and for intermediate stage of fire before and after flash-over above 550°C.
