Limiting oxygen index
In the history of humanity, Limiting oxygen index has played a fundamental role in the development and evolution of society. Since its inception, Limiting oxygen index has captured people's attention and imagination, inspiring all kinds of experiences, emotions and reflections. Whether due to its impact on popular culture, its influence in the scientific field or its relevance in world politics, Limiting oxygen index has left an indelible mark on history. In this article we will explore the role that Limiting oxygen index has played over time and how it has shaped the course of humanity in different aspects.
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.[2]
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.
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.
Materials with an LOI greater than the atmospheric oxygen concentration are called fire retardant materials.[3]
See also
References
- ^ Definition taken from Principles of Polymer Engineering (2nd edition) by N.G. McCrum, C.P. Buckley, and C.B. Bucknall
- ^ ASTM D 2863, Standard Test Method for Measuring the Minimum Oxygen Concentration to Support Candle-Like Combustion of Plastics (Oxygen Index).
- ^ "Fire-retardant materials". www.ias.ac.in. Retrieved 2019-01-11.
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