| When a flammable substance (mainly a liquid) is heated at a constant temperature and a flame is brought close to it, it generates vapor of the concentration required for instantaneous ignition. Flash point at the lowest temperature tf l That is. | ||||
| Quality | tf l / ℃ | Quality | tf l / ℃ | |
|---|---|---|---|---|
| Jetyl ether | -45 | Xylene | 27 | |
| gasoline | -43 or less | kerosene | 40～60 | |
| Oil benzine | -40 or less | Light oil | 50～70 | |
| Carbon disulfide | -30 | heavy oil | 60～100 | |
| acetone | -20 | Aniline | 70 | |
| benzene | -11 | Naphthalene | 79 | |
| Thinners | -9 | Nitrobenzene | 88 | |
| toluene | 4 | Machine oil | 106～270 | |
| Methyl alcohol | 11 | Sesame oil | 289～304* | |
| Ethyl alcohol | 13 | rapeseed oil | 313～320* | |
| * : NOF Inspection Association, 1992 Rating Results Report (1993). | ||||
| References: "Science Chronological Tables" (National Astronomical Observatory of Japan, 2000 edition) Physics / Chemistry Heat and Temperature Material 57 (481) Quoted from the flash point of the substance. | ||||