The ignition temperature (also or point of inflammation) is that temperature, on which one must heat a material or a contact surface up, so that an inflammable substance (solid, liquid and/or their steams or gas) in presence of atmospheric oxygen without can catch fire automatically.
With the clearly lower flash point a gas/an air mixture of the same substance can be inflamed only by means of ignition source. At flash point temperature a liquid achieves a steam pressure and/or a corresponding saturation steam concentration, which is so high that the appropriate gas/air mixture can be ignited.
The explosiveness of a gas mixture depends subordinated also on the oxygen content of the surrounding atmosphere. Standard conditions refer to 20% oxygen in air. Since large-scale installations (tank, container) cannot be inertisieren with nitrogen up to a remainder oxygen content of 0%, in special measurements that minimum forces border oxygen content for an ignition determined (e.g. 2-4%).
The ignition temperature does not correlate with boiling point or flash point temperature of an inflammable material. It is rather a measure for the oxidation sensitivity of the substance.
Solvents with particularly low ignition temperatures (approx. 120-180"°C) are:
" . in work"
Ignition temperature of some solids:
|Solid||Ignition temperature in "°C|
Ignition temperatures and flash points of some liquid fuels:
|Liquid||Flash point in "°C||Ignition temperature in "°C|
|Turpentine oil||36||255 http://www.sax.ch/sax/www/prodinfo/sicherheit/lh/terpentinoel-rein.html|