<\/p>\n\n
What is the auto-ignition temperature (TAI)?<\/h2>\n\n
<\/p>\n\n
The auto-ignition temperature (AIT) is the lowest temperature at which a gaseous mixture (air-vapor) ignites spontaneously in the absence of an ignition source<\/strong>, such as a flame or spark. <\/p>\n\n In reality, ignition results from the production of vapors, which are themselves caused by a sufficiently high temperature in the atmosphere. <\/p>\n\n This is referred to as the self-ignition<\/strong> or ignition point<\/strong>, or the spontaneous ignition point.<\/p>\n\n The auto-ignition point<\/a>should not be confused with the flash point,<\/strong> i.e. the temperature at which self-combustion<\/strong>, once initiated, can continue. It is, in a way, the octave above the flash point. <\/strong> <\/p>\n\n The latter refers to the temperature at which a liquid produces sufficient vapors to ignite in the presence of an ignition source. <\/p>\n\n It is therefore essential to check temperature classes in ATEX zones<\/strong><\/a> <\/strong>zones. <\/p>\n\n <\/p>\n\n <\/p>\n\n <\/p>\n\n When the self-ignition temperature<\/strong> is reached, so is the activation energy required for combustion. Temperatures vary according to a number of factors<\/strong>, such as : <\/p>\n\n The temperature at which a gas mixture can ignite decreases as the pressure or oxygen concentration increases. <\/p>\n\n Above the auto-ignition point, a vapor-air mixture ignites on its own. In fact, the mere contact of hot air is sufficient. <\/strong> <\/p>\n\n How can we explain this phenomenon? The higher the temperature of an atmosphere, the more gases become agitated at the molecular level, and the greater the likelihood of a chemical reaction between two molecules. <\/p>\n\n From this point onwards, all it takes is a little steam to ignite the whole mixture. <\/p>\n\n This is how many fires and explosions <\/strong> are caused in ATEX zones. <\/strong> <\/p>\n\n <\/p>\n\n <\/p>\n\n Most flammable gases and liquids have an auto-ignition temperature<\/strong> of between 300\u00b0C and 550\u00b0C. <\/strong> <\/p>\n\n However, some have very low auto-ignition points, e.g. 160\u00b0 for diethyl ether<\/strong>.<\/p>\n\n Here is a brief list of gases and liquids whose TAI you need to know: <\/p>\n\n <\/p>\n\n <\/p>\n\n <\/p>\n\n <\/p>\n\n Would you like to know more about the risks associated with self-ignition of gases and liquids in ATEX zones? <\/strong> <\/p>\n\n![\"fire](\"https:\/\/adf-systemes.fr\/wp-content\/uploads\/2023\/07\/temperature-du-feu-1024x689.jpg\")
<\/figure>\n\nWhat happens when the auto-ignition point is reached? <\/h2>\n\n
\n
![\"\"](\"https:\/\/adf-systemes.fr\/wp-content\/uploads\/2024\/02\/banniere-adf-guide-1024x269.webp\")
<\/a><\/figure>\n\nWhat is the auto-ignition temperature of gases and liquids? <\/h2>\n\n
Auto-ignition temperatures of gases<\/h3>\n\n
\n
Self-ignition temperatures of liquids<\/h3>\n\n
\n