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Abstract
The effect of the porous structure on the flammability characteristics of rigid polyurethane foams is studied. It is found that the velocity of the downward flame spread over the surface of foam slabs increases as the oxygen content into the ambient flow increases and the effective density of PU foams decreases.
The measurements of temperature profiles into the combustion wave made by Pt-PtRh thermocouples are used for the determination of the rate-controlling energy-transfer mechanisms.