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The Oil Stability Index Analysis method was subjected to a fifteen‐laboratory collaborative study in which the participants used currently available commercial and home‐built instruments to provide data to support the approval process as an Official Method of the American Oil Chemists’ Society. The overall average coefficient of variation was 11.3% for samples from 7 to 80 h of stability testing at 110°C.
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Jebe et al. (1993) studied this question.
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