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The autoignition temperature or self-ignition temperature, often called spontaneous ignition temperature or minimum ignition temperature (or shortly ignition temperature) and formerly also known as kindling point, of a substance is the lowest temperature at which it spontaneously ignites in a normal atmosphere without an external source of ignition, such as a flame or spark. [1]
The fire point, or combustion point, of a fuel is the lowest temperature at which the liquid fuel will continue to burn for at least five seconds after ignition by an open flame of standard dimension. [1] At the flash point, a lower temperature, a substance will ignite briefly, but vapour might not be produced at a rate to sustain the fire ...
The flash point is sometimes confused with the autoignition temperature, the temperature that causes spontaneous ignition. The fire point is the lowest temperature at which the vapors keep burning after the ignition source is removed.
A large compost pile can spontaneously combust if improperly managed. Spontaneous combustion or spontaneous ignition is a type of combustion which occurs by self-heating (increase in temperature due to exothermic internal reactions), followed by thermal runaway (self heating which rapidly accelerates to high temperatures) and finally, autoignition. [1]
The ignition source can be a smouldering object, or the stirring up of embers by the air track. Such an event is known as backdraft . A delayed flashover occurs when the colder gray smoke cloud ignites after congregating outside of its room of origin.
While in the Navy on a submarine we were taught 450F was the ignition point of paper. The manual is the NSTM 555 (you can google it, first result is a .pdf). It's basically the navy's how-to for firefighting and gives the ignition points (I don't remember exactly where) of several common materials on ships.
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Paraffin wax is mostly found as a white, odorless, flavourless, waxy solid, with a typical melting point between about 46 and 68 °C (115 and 154 °F), [6] and a density of around 900 kg/m 3. [7] It is insoluble in water, but soluble in ether , benzene , and certain esters .