ISO 4589 Oxygen Index Test
The ISO 4589 Oxygen Index Test describes a method to determine the minimum concentration of oxygen that will support the combustion of a small vertical test specimen, giving an indication of the flammability of the material.
The small test specimen is held in the transparent chimney and a calibrated mixture of oxygen and nitrogen is flowing through the chimney and around the specimen. The upper end of the specimen is ignited and the subsequent burning behaviour is observed, checking the duration of the burning and the length of the specimen that is burnt, conducting a series of tests on a number of specimens. This allows us to determine the precise oxygen index.
