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Page Title:
Table 5-5. Class I Division 1 and Class I Division 2 summary of selected hazardous atmospheres |
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|  Table 5-5. Class I Division 1 and Class I Division 2 summary of selected hazardous atmospheres
Ignition1
Flammable limits3
NEMA enclosure4
Flashpoint3
Temperature
(% by volume)
classification
Ignition2
energy
F
C
F
C
Group3 Atmosphere
(millijoules) Lower
Upper
Indoor
Outdoor
A
Acetylene
581
305
0.017
2.5
100.0
Gas
Gas
7
8
B
1,3-butadiene
788
420
--
2.0
12.0
Gas
Gas
7
8
B
Ethylene oxide
804
429
--
3.0
100.0
-20
-28
7
8
B
968
520
0.017
4.0
75.0
Gas
Gas
7
8
B
Manufactured gas
--
--
--
--
--
--
--
--
--
containing more than
30 % hydrogen by volume)
B
Propylene oxide
840
449
--
2.6
36.0
-35
-37
7
8
C
Acetaldehyde
347
175
--
4.0
60.0
-38
-39
7
g
C
Diethyl ether
320
160
--
1.9
36.0
-49
-45
7
8
C
Ethylene
842
450
0.08
2.7
36.0
Gas
Gas
7
8
C
Unsymmetrical
480
249
--
2.0
95.0
5
-15
7
8
dimethyl hydrazine
(UDMH)
D
Acetone
869
465
--
2.5
13.0
-4
-20
7
8
D
Acrylonitrile
898
481
--
3.0
17.0
32
0
7
8
D
Ammonia
928
498
--
15.0
28.0
Gas
Gas
7
8
D
Benzene
928
498
--
1.3
7.9
12
-11
7
8
D
Butane
550
288
--
1.6
8.4
Gas
Gas
7
D
1-butanol
650
343
--
1.4
11.2
98
37
7
8
1.7@212F
9.0@212F
D
2-butanol
761
405
--
75
24
7
8
D
n-butyl acetate
790
421
--
1.7
7.6
72
22
7
8
D
Cyclopropane
938
503
0.25
2.4
10.4
Gas
Gas
7
8
D
Ethane
882
472
--
3.0
12.5
Gas
Gas
7
8
D
Ethanol
685
363
--
3.3
19.0
55
13
7
8
D
Ethylacetate
800
427
--
2.0
11.5
24
-4
7
8
D
Ethylene dichloride
775
413
--
6.2
16.0
56
13
7
8
D
Gasoline
536 to 880
280 to 471
--
1.2 to 1.5
7.1 to 7.6
7
8
7
8
D
Heptane
399
204
--
1.05
6.7
-36 to -50
-38 to -46
7
8
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