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In page Polystyrene:

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If polystyrene is properly incinerated at high temperatures (up to 1000 °C[1]) and with plenty of air[1] (14 m3/kg[citation needed]), the chemicals generated are water, carbon dioxide, and possibly small amounts of residual halogen-compounds from flame-retardants.[1] If only incomplete incineration is done, there will also be leftover carbon soot and a complex mixture of volatile compounds.[2] According to the American Chemistry Council, when polystyrene is incinerated in modern facilities, the final volume is 1% of the starting volume; most of the polystyrene is converted into carbon dioxide, water vapor, and heat. Because of the amount of heat released, it is sometimes used as a power source for steam or electricity generation.[1][3]