AbstractSmoke evolved from burning poly‐(vinychloride) plasticized with diisooctylphthalate has been studied using a light absorption method. It has been shown that the quantity of smoke produced depends upon the oxygen concentration of the oxidizing gas as well as on the concentration of diisooctylphthalate present in the polymer. The results of this work have been analysed using an empirical equation proposed by the authors, which correlates the maximum smoke density (σmax) with oxygen concentration. This equation may be writtendocumentclass{article}pagestyle{empty}begin{document}$$ sigma _{max } = sigma _{LOI} exp (- k(No_2 - LOI)) $$end{document}where No2is the molar concentration of oxygen in the oxidizing gas, and LOI refers to the limiting or critical concentration of oxygen at which at the polymer will just burn, as defined by the ASTM test 2863. The effect of various additives, particularly organic iodine compounds, as smoke suppressants has also been investigat
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