Auto Ignition Temperature
The Auto-Ignition Temperature - or the minimum temperature required to ignite a gas or vapor in air without a spark or flame being present - are indicated for some common fuels below:
| Flammable Substance | Temp (Deg C) | Temp (Deg F) |
| Acetaldehyde | 175 | 347 |
| Acetone | 465 | 869 |
| Acetylene | 305 | 581 |
| Anthracite - glow point | 600 | 1112 |
| Benzene | 560 | 1040 |
| Bituminous coal | 454 | 850 |
| Butane | 420 | 788 |
| Carbon | 700 | 1292 |
| Carbon - bi sulfide | 149 | 300 |
| Carbon monoxide | 609 | 1128 |
| Charcoal | 349 | 660 |
| Coal-tar oil | 580 | 1076 |
| Coke | 700 | 1292 |
| Cyclohexane | 245 | 473 |
| Diethyl ether | 160 | 320 |
| Ethane | 515 | 859 |
| Ethylene | 490 | 914 |
| Ehtyl Alcohol | 365 | 689 |
| Fuel Oil No.1 | 210 | 410 |
| Fuel Oil No.2 | 256 | 494 |
| Fuel Oil No.4 | 262 | 505 |
| Heavy hydrocarbons | 750 | 1382 |
| Hydrogen | 500 | 932 |
| Gas oil | 336 | 637 |
| Gasoline | 280 | 536 |
| Gun Cotton | 221 | 430 |
| Kerosene | 295 | 563 |
| Isobutane | 462 | 864 |
| Isopentane | 420 | 788 |
| Isopropyl Alcohol | 399 | 750 |
| Light gas | 600 | 1112 |
| Light hydrocarbons | 650 | 1202 |
| Lignite - glow point | 562 | 979 |
| Methane (Natural Gas) | 580 | 1076 |
| Methyl Alcohol | 385 | 725 |
| Naphtha | 550 | 1022 |
| Neohexane | 425 | 797 |
| Neopentane | 450 | 842 |
| Nitro-glycerine | 254 | 490 |
| n-Butane | 405 | 761 |
| n-Heptane | 215 | 419 |
| n-Hexane | 225 | 437 |
| n-Octane | 220 | 428 |
| n-Pentane | 260 | 500 |
| n-Pentene | 298 | 569 |
| Oak Wood - dry | 482 | 900 |
| Peat | 227 | 400 |
| Petroleum | 400 | 752 |
| Pine Wood - dry | 427 | 800 |
| Phosphorous, amorphous | 260 | 500 |
| Phospho's, transparent | 49 | 120 |
| Propane | 480 | 842 |
| Propylene | 458 | 856 |
| p-Xylene | 530 | 986 |
| Rifle Powder | 288 | 550 |
| Toluene | 530 | 986 |
| Semi anthracite coal | 400 | 752 |
| Semi bituminous coal | 527 | 980 |
| Styrene | 490 | 914 |
| Sulphur | 243 | 470 |
| Wood | 300 | 572 |
| Xylene | 463 | 867 |
The flammable (explosive) range is the range of a gas or vapor concentration that will burn or explode if an ignition source is introduced. Limiting concentrations are commonly called the lower explosive or flammable limit (LEL/LFL) and the upper explosive or flammable limit (UEL/UFL).
Below the explosive or flammable limit the mixture is too lean (diluted) to burn. Above the upper explosive or flammable limit the mixture is too rich (saturated) to burn. The Auto-Ignition Temperature is not the same as Flash Point - The Flash Point indicates how easy a chemical may burn.