Sources of ignition and autoignition temperature

Flammable liquid flash point (closed cup) 21°C (70°F) vapor pressure 17 torr at 25°C (77°F) vapor density 2.0 (air=l) the vapor is heavier than air and may travel a considerable distance to a source of ignition and flash back autoignition temperature 378°C (713°F) forms explosive mixtures with air in the range 2.5-18.0% by volume in air. It is susceptible to forming peroxides on prolonged exposure to air. 

Highly flammable flash point (open cup) -18°C (-0.5°F) (Aldrich 1989), closed cup -36°C (-33°F) vapor pressure 214 torr at 20°C (68°F) vapor density 1.93 (air = 1) vapor may travel a considerable distance to a source of ignition and flash back autoignition temperature 234°C (453°F) (unstable) fire-extinguishing agent alcohol foam, dry chemical, or CO2 use a water spray to keep the fire-exposed containers cool, to flush and dilute the spill, and to disperse the vapor. 

Highly flammable hquid flash point (closed cup) -37°C (-35°F), open cup -26°C (—15°F) vapor pressure 478 torr at 20°C (68°F) vapor density 2.0 (air = 1), the vapor is heavier than air and can travel some distance to a source of ignition and flashback autoignition temperature 402°C (756°F) fireextinguishing agent dry chemical, CO2, or alcohol foam use water to keep fire-exposed containers cool and to flush and dilute the spiU. 

Flammable gas vapor pressure 910 torr being heavier than air, it can travel a considerable distance to a source of ignition and Hash back autoignition temperature 429° C (804°F) fire-extinguishing measure stop the fiow of gas use a water spray to keep the surrounding area and fire- exposed containers cool. Butadiene vapors may polymerize and block the vents (NFPA 1997). 

Flammable gas flashback fire hazard in the presence of an ignition source autoignition temperature 324°C/615.2°F (NFPA 1986) forms explosive mixtures with air within the range 1.8-9.7% by volume Flammable gas heavier than air the gas can travel a considerable distance to a source of ignition and flash back aufoignilion temperature 465°C/869°F (NFPA 1986) forms explosive mixtures with air within the range... 

Combustion of a flammable gas-air mixture occurs if the composition of the mixture lies in the flammable range and if there is a source of ignition. Alternatively, combustion of the mixture occurs without a source of ignition if the mixture is heated up to its autoignition temperature. 

Flash points and autoignition temperatures are given in Table 11. The vapor can travel along the ground to an ignition source. In the event of fire, foam, carbon dioxide, and dry chemical are preferred extinguishers. The lower and upper explosion limits are 1% and 7%. 

Another test (ASTM E-659) is available that can be used as a complement to the flash point test and involves determination of the autoignition temperature. However, the flash point should not be confused with the autoignition temperature, which measures spontaneous combustion with no external source of ignition. 

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