| Definition: | lowest temperature (of a hot surface) at which, under specified conditions, an ignition of a flammable gas or vapour in mixture with air/inert gas occurs Note 1 to entry: This note applies to the French language only. Note 2 to entry: The conditions are specified in ISO/IEC 80079-20-1, Explosive atmospheres – Part 20-1: Material characteristics for gas and vapour classification – Test methods and data.
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