Abstract
AbstractLimiting oxygen index values of single and multilayer Proban CC‐ and Pyrovatex CP‐flame retardant finished cotton fabrics having a variety of area densities were determined as a function of igniter application time and temperatures up to 200°C. Except for the lightweight (140 g m−3) Proban CC‐treated fabrics, LOI, like comparable extinction oxygen index (EOI) values, increased as ignition times were increased from 2 to 10 s. Extrapolation to zero ignition time enabled [LOI]0 values to be determined at each temperature, which, for a given flame retardant, increased linearly with area density of mono‐ and multilayered fabric combinations. Comparison with earlier extinction oxygen index results showed that this [LOI]0 vs. area density dependence had significantly lower correlation than that for [EOI]0. These ṕoor former correlations further substantiated the claims that the EOI concept offers a more effective means of quantifying textile fabric flammability. Analysis of the linear relationships enabled intrinsic limiting oxygen index, L0, and area density‐dependent, L1, terms to be determined. Like conventional LOI values, L0, values also reduce significantly at elevated temperatures.
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