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The Quantification of Fabric Extinguishability

A method has been developed for quantifying the extinguishability of burning fabrics which sepa rates extinguishability due to thermal loss from that due to blocking the transport of vaporized fuel and/or oxygen to the combustion zone. The maximum rate of heat emission during upward burning is measured using convective calorimetry for freely-hanging samples having asbestos paper stapled to one side in several arrangements. The mass of the heat sink is varied by using different numbers of asbestos layers; the vapor transport barrier is varied by drilling different numbers of holes in the asbestos. It is found that vapor blockage generally affects extinguishment to a much greater extent than heat loss. In addition, the effectiveness of the barrier is different for different fabrics, so that extinguishability ranking in terms of heat-emission rate depends on whether or not the fabrics are burned in contact with an inert substrate.