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Page Title:
Table 5-5. Class I Division 1 and Class I Division 2 summary of selected hazardous atmospheres (continued) |
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|  Table 5-5. Class I Division 1 and Class I Division 2 summary of selected hazardous atmospheres (continued).
Ignition1
Flammable limits3
NEMA enclosure4
Flashpoint3
Temperature
(% by volume)
classification
Ignition2
energy
F
C
F
C
Group3 Atmosphere
(millijoules) Lower
Upper
Indoor
Outdoor
D
Hexane
437
225
--
1.1
7.5
-7
-22
7
8
9.0@212F
D
Isoamyl alcohol
662
350
--
1.2
109
43
7
8
D
Isoprene
428
220
--
1.5
8.9
-65
-54
7
8
D
Methane
999
630
0.30
5.0
15.0
Gas
Gas
7
8
D
Methanol
725
385
--
6.0
36.0
52
11
7
8
1.7@200F
11.4@200F
D
Methyl ethyl ketone
759
404
--
16
-9
7
8
1.2@200F
8.0@200F
D
Methyl isobutyl ketone 840
449
--
64
18
7
8
1.7@123F
10.6@202F
D
2-methyl-1-propanol
780
416
--
82
28
7
8
D
2-methyl-2-propanol
892
478
--
2.4
8.0
52
11
7
8
D
Naphtha (petroleum)
550
288
--
1.1
5.9
<0
<-18
7
8
D
Octane
403
206
--
1.0
6.5
56
13
7
8
D
Pentane
470
243
--
1.5
7.8
< -40
< -40
7
8
10.0@212F
D
l-pentanol
572
300
--
1.2
91
33
7
8
D
Propane
842
450
0.25
2.1
9.5
Gas
Gas
7
8
D
l-propanol
775
413
--
2.2
13.7
74
23
7
8
12.7@200F
D
2-propanol
750
399
--
2.0
54
12
7
8
D
Propylene
851
455
--
2.0
11.1
Gas
Gas
7
8
D
Styrene
914
490
--
1.1
7.0
88
31
7
8
D
Toluene
896
480
--
1.2
7.1
40
4
7
8
D
Vinyl acetate
756
402
--
2.6
13.4
18
-8
7
8
D
Vinyl chloride
882
472
--
3.6
33.0
Gas
Gas
7
8
D
Xylenes
867 to 984
464 to 529
--
1.0 to 1.1
7.6
81 to 90
27 to 32
7
8
Notes:
1 See NFPA 325 and 497M.
2 See "Handbook of Fire Protection Engineering", Society of Fire Protection Engineers.
3 See NFPA 325.
4 See NEMA 250, "Enclosures for Electrical Equipment."
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