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Limiting oxygen index

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The limiting oxygen index (LOI) is the minimum concentration of oxygen, expressed as a percentage, that will support combustion of the polymer. It is measured by passing a mixture of O2 and N2 over a burning specimen, and reducing the O2 level until a critical level is reached. [1]

  1. ^ Definition taken from Principles of Polymer Engineering (2nd edition) by N.G. McCrum , C.P. Buckley, and C.B. Bucknall

www.saassociates.com/pdf/criticaloxygen.pdf


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