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Flammable Liquid

Flammable liquid is defined that the liquid easy to be fired. But the easiest of each liquid or gasses have scale, on the chemical engineer this material is being classes as in the table below. As on the table describe of boiling point, flash point and ignition temperature of each material. Boiling point is the temperature which the material beginning to boil like water will boil at 100 oC at 1 atmosphere pressure. Flash point is the lowest temperature at which material will ignite, but flash point is not autoignite, at which material will fired by itself.

Flammable liquid is grouping into their gas group, the group of flammable liquid is just use for using an equipment that is suitable for this environment. Some equipment is not suitable with this liquid properties and can make broken to certain equipment if forced using on this environment. Ignition temperature is the point that material will starting fired when put in heat source into the material.

Group specification and characteristics of some common flammable liquids, gases, and vapor are listed in the table below:
 
Material
Boiling Point
oC
Flash Point
oC
Ignition Temp.
oC
Acetone
56
-20
465
Acetylene
-83
Gas
305
Ammonia
-33
Gas
651
Benzene
80
12
498
Butane
-1
Gas
287
Carbon Monoxide
-192
Gas
609
Ethane
-89
Gas
472
Ethyl Monoxide
78
55
363
Ethylene
-104
Gas
450
Heptane
98
-4
204
Hydrogen
-252
Gas
500
Hydrogen Cyanide
26
-18
538
Methane
-162
Gas
537
Propane
-42
Gas
432
Toluene
111
4
480

The data given in that table is derived from NFPA 325M. Flash point is the lowest temperature at which a material give off sufficient vapor to form an explosive gas/air mixture in the air immediately above the surface.
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