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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 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. [1]

LOI values for different plastics are determined by standardized tests, such as the ISO 4589 and ASTM D2863 (which are technically equivalent).[2]

See also

References

  1. ^ Definition taken from Principles of Polymer Engineering (2nd edition) by N.G. McCrum , C.P. Buckley, and C.B. Bucknall
  2. ^ Limiting Oxygen Index - retrieved April 19, 2010.
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