are typically measured using a 500 ml flask placed in a temperature-controlled oven in accordance with the procedure described in ASTM E659.

When measured for plastics, autoignition temperature can also be measured under elevated pressure and at 100% oxygen concentration. The resulting value is used as a predictor of viability for high-oxygen service. The main testing standard for this is ASTM G72.

Autoignition time equation

The time it takes

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