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The LOI value is also dependent on the surrounding temperature of the sample. The percent of oxygen required for combustion reduces as the surrounding temperature is increased.
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Plastics and cable material is tested for its LOI value at both ambient temperature and elevated temperature to understand its oxygen requirement under actual fire conditions.
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Standard Test Method for
Measuring the Minimum Oxygen Concentration to Support Candle-Like Combustion of Plastics (Oxygen Index).
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Definition taken from
Principles of Polymer Engineering (2nd edition) by N.G. McCrum , C.P. Buckley, and C.B. Bucknall
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Materials with an LOI greater than the atmospheric oxygen concentration are called fire retardant materials.
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LOI values for different plastics are determined by standardized tests, such as the ISO 4589 and ASTM D2863.
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over a burning specimen, and reducing the oxygen level until a critical level is reached.
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