What is the limiting oxygen index (LOI)? Which burns more easily, a material with an LOI of 21 or of 17?
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The LOI is a test for flammability of a plastic sample. In this test the sample is supported in a candle-like arrangement and ignited. The composition of the gases surrounding the burning sample is controlled and gradually the amount of oxygen is reduced or increased until the sample will just barely burn. That level of oxygen is called the limiting oxygen index. The sample with an LOI of 17 is more easily burned.
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