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The '''limiting oxygen index (LOI)''' is the minimum concentration of [[oxygen]], expressed as a percentage, that will support [[combustion]] of a [[polymer]]. It is measured by passing a mixture of oxygen and [[nitrogen]] over a burning specimen, and reducing the oxygen level until a critical level is reached. <ref>Definition taken from Principles of Polymer Engineering (2nd edition) by N.G. McCrum , C.P. Buckley, and C.B. Bucknall</ref>
==See also==
* [[Fire-resistance rating]]
==References==
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