Abstract
Analysis on the data of fire test concerning various organic building materials has been pursued by the Madison-type tunnel furnace in the following items.
A) Flame-Spread Velocity
B) Heat Evolved
C) Smoke Evolved
We have reached to the following conclusion based on the above data ;
The smoke evolved from the materials deeply relates to the flame-spread velocity of the test material in the combustion-furnace and linear relation has been obtained between smoke density in terms of light-transmission and heat evolved per unit inch of flame-spread.
This can be derived from the ratio of the differentials taken at a given time on Q vs t diagram curve and flame spread Q vs t diagram curve.
The size-distribution of smoke-systems has been estimated with the aid of ROYCO particle Counter concerning plastics and woods.
The results agrees with the one from the data on Z-valves from Light-Scattering and on the photographic observation by Electron microscope.
The results illustrates the following fact that the flame-retardant works on the material to the increase of the Smoke density or mean particle size of the Smoke.
