What is the definition of oxygen index

 

When testing the limit oxygen index of the material, the sample is vertically fixed in a transparent combustion cylinder of upwardly flowing oxygen and nitrogen mixed gas, the top of the sample is ignited, the combustion characteristics of the sample are observed, and the continuous burning time of the sample or the burning length of the sample Compared with the given limit value, the lowest oxygen concentration value expressed as the percentage of oxygen while maintaining combustion is measured through a series of tests under different oxygen concentrations.

 

　　Then before the lowest oxygen concentration value is obtained, the combustion characteristics of the material at other oxygen concentrations are called the combustion characteristics under the oxygen index.

 

　　 However, in actual use, in most cases, the oxygen index we are talking about is the limiting oxygen index.

 

The oxygen index is used to evaluate the combustion performance of materials. A high oxygen index indicates that the material is not easy to burn, and a low oxygen index indicates that the material is easy to burn. It is generally considered that an oxygen index <22 is a flammable material, and an oxygen index between 22 and 27 is a combustible material. , Oxygen index>27 is a flame-retardant material.

 

　　Oxygen index measurement generally uses an oxygen index meter, which can be implemented in accordance with ISO 4589-2, ASTM D2863, GB/T 2406, GB/T 5454 and other standards.

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