The lower and upper
explosion concentration limits for some common gases are indicated in the table
below. Some of the gases are commonly used as fuel in combustion processes.
Fuel Gas
|
"Lower
Explosive or Flammable Limit"
(LEL/LFL) (%) |
"Upper
Explosive or Flammable Limit"
(UEL/UFL) (%) |
Acetaldehyde
|
4
|
60
|
Acetone
|
2.6
|
12.8
|
Acetylene
|
2.5
|
81
|
Ammonia
|
15
|
28
|
Arsine
|
5.1
|
78
|
Benzene
|
1.35
|
6.65
|
n-Butane
|
1.86
|
8.41
|
iso-Butane
|
1.80
|
8.44
|
iso-Butene
|
1.8
|
9.0
|
Butylene
|
1.98
|
9.65
|
Carbon Disulfide
|
1.3
|
50
|
Carbon Monoxide
|
12
|
75
|
Cyclohexane
|
1.3
|
8
|
Cyclopropane
|
2.4
|
10.4
|
Diethyl Ether
|
1.9
|
36
|
Ethane
|
3
|
12.4
|
Ethylene
|
2.75
|
28.6
|
Ethyl Alcohol
|
3.3
|
19
|
Ethyl Chloride
|
3.8
|
15.4
|
Fuel Oil No.1
|
0.7
|
5
|
Hydrogen
|
4
|
75
|
Isobutane
|
1.8
|
9.6
|
Isopropyl Alcohol
|
2
|
12
|
Gasoline
|
1.4
|
7.6
|
Kerosine
|
0.7
|
5
|
Methane
|
5
|
15
|
Methyl Alcohol
|
6.7
|
36
|
Methyl Chloride
|
10.7
|
17.4
|
Methyl Ethyl Ketone
|
1.8
|
10
|
Naphthalene
|
0.9
|
5.9
|
n-Heptane
|
1.0
|
6.0
|
n-Hexane
|
1.25
|
7.0
|
n-Pentene
|
1.65
|
7.7
|
Neopentane
|
1.38
|
7.22
|
Neohexane
|
1.19
|
7.58
|
n-Octane
|
0.95
|
3.20
|
iso-Octane
|
0.79
|
5.94
|
n-Pentane
|
1.4
|
7.8
|
iso-Pentane
|
1.32
|
9.16
|
Propane
|
2.1
|
10.1
|
Propylene
|
2.0
|
11.1
|
Silane
|
1.5
|
98
|
Styrene
|
1.1
|
6.1
|
Toluene
|
1.27
|
6.75
|
Triptane
|
1.08
|
6.69
|
p-Xylene
|
1.0
|
6.0
|
Note! The limits indicated
are for gas and air at 20oC and atmospheric pressure.
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