EN4589-2 /EN ISO 4589-2 oxygen index test


1. EN4589-2 /EN ISO 4589-2--Standard
EN ISO 4589-2: Plastics-Determination of burning behaviour by oxygen index CPart 2: Ambient-temperature test

Oxygen index: The minimum concentration of oxygen, by volume percentage, in a mixture of oxygen and nitrogen introduced at (232) that will just support combustion of a material under specified test conditions.

EN ISO 4589-2 is similar with GB/T 2406


2. EN4589-2 /EN ISO 4589-2test method
A small test specimen is supported vertically in a mixture of oxygen and nitrogen flowing upwards through a transparent chimney. The upper end of the specimen is ignited and subsequent burning behaviour of the specimen is observed to compare the period for which burning continues, or the length of specimen burnt, with specified limits for such burning. By testing a series of specimen is different oxygen concentration, the minimum oxygen concentration is estimated.


3. EN ISO 4589-2/EN45545-2scope

The European standard EN45545-2 R25 (interior of small scale) and R26 (exterior of small scale) fire performance according to the EN ISO 4589-2 oxygen index, according to the risk degree of rail vehicle operation are different, the requirements of the EN45545-2 standard EN ISO 4589-2 oxygen index data are also different.

The European standard EN45545-2 R25 (interior of small scale): risk rating of HL1-H3 vehicle requirements, the oxygen index of LOI 28%. The risk rating of HL4 vehicle requirements, the oxygen index of LOI 32%.

The European standard EN45545-2 R26 (exterior of small scale): risk rating of HL1-H3 vehicle requirements, the oxygen index of LOI 28%. The risk rating of HL4 vehicle requirements, the oxygen index of LOI 32%.


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