For certain materials, the velocity of the mixed gas stream used in an oxygen index determination has been reported to exert a strong influence on the ex perimental result. It is now possible to rationalise these reported dependences which are shown to result from the form of column used in the test. A proposed modification to the column outlet eliminates the dependence of oxygen index on gas velocity over the range of gas velocity permitted by the testing standards.
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R. K. Wharton (1983) studied this question.