Difference Between Oxygen Index and Limit Oxygen Index

First, the oxygen index and the limit oxygen index, respectively, what is the meaning, what is the point?The limit oxygen index refers to the minimum oxygen concentration, also known as the oxygen limit and the oxygen index, required for the material to maintain the state of combustion in the oxygen-nitrogen mixture under specified test conditions. It is worth noting that the oxygen index does not refer to the oxygen fraction of oxygen gas mixed with the volume fraction of oxygen, this is the oxygen concentration value.Oxygen index is high that the material is not easy to burn, the oxygen index is low that the material is easy to burn, it is generally believed that the oxygen index <22 is a flammable material, oxygen index between 22 --- 27 is a combustible material, oxygen index> 27 is a flame retardant material.

Second, how to calculate the limit oxygen indexThe limiting oxygen index LO I is expressed as a percentage by volume and is calculated as follows:LO I = cF ten k dWhere: LO I - limit oxygen index,%;CF a test of the last oxygen concentration, take a decimal,%;D a test when the difference between the two oxygen concentration, take a decimal,%;K a coefficient, look-up table.When LO I is reported, the LO I should be calculated to the decimal two bits when calculating the standard deviation e.

oxygen index tester

Third, the limit oxygen index test K value is determinedIf the last five oxygen index values ​​are tested, the first reaction symbol is "X", find the corresponding five measured response symbols in the first column of the table below, and find out from the item (a) The number of K numbers corresponding to the number of "O".
Four, oxygen index tester or limit oxygen index analyzer is used to test whatUsed to test the ultimate oxygen index of the material to evaluate the combustion properties of the material. Suitable materials include homogeneous solid materials, laminates, foams, films and films.
Five, oxygen index tester for what is the standardISO 4589-2, ASTM D2863, GB / T 2406, GB / T 5454

oxygen index tester

Six, oxygen index tester principleThe sample was vertically fixed in the transparent combustion tube of oxygen and nitrogen mixed gas, igniting the top of the sample, observing the burning characteristics of the sample, comparing the continuous burning time of the sample or the burning length of the sample to a given limit , The lowest oxygen depth values ​​expressed as the percentage of oxygen at the time of combustion were measured by a series of tests at different oxygen concentrations.

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