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Substance Molecular Weight NEC
Gas
Group		 Ignition Temp
(F)		 Lower Heating
Value (Btu/CF)		 Lower Heating
Value (Btu/Lb)		 Specific Gravity
(Air=1)		 Lbs per CF CF per Lb
Acetaldehyde 44 C 365 1.5 0.1100 8.71
Acetone 58 D 1000 2.0 0.1500 6.53
Acetylene - C2H2 26.030 A 571 1438 20617 0.901 0.0686 14.560
Air 28.9 - - - - 1 0.0766 13.063
Ammonia - NH3 17.031 D 1204 365.1 8001 0.5961 0.0456 21.914
Amyl Alcohol 87 D 572     3.0    
Argon - A 39.948 - - - - 1.3775 0.1054 9.487
Benzene - C6H6 78.180 D 1044 3780 18341 2.705 0.2063 4.848
Butadiene 54 BD** 804 1.9
n-Butane - C4H10 58.120 D 723 3142 19815 2.0665 0.1582 6.321
Isobutane - C4H10 58.120 D 864 3105 19529 2.0665 0.1582 6.321
n-Butene - C4H8 56.104 D 723 2990 20203 1.941
Butylene - C4H8 56.104 D 723 2990 20203 1.941
Isobutene - C4H8 56.104 D 615 2980 20135 1.941
Carbon - C  * 12.01 - - - 14093 - - -
Carbon Dioxide - CO2 44.01 - - - - 1.5282 0.1170 8.548
Carbon Monoxide - CO 28.01 C 1128 321.6 4323 0.9672 0.0740 13.506
Carbon Disulfide - CS2 76.130 *** 212 1205 5380 2.634
Cyclopropane C 928 1.5
Di-ethyl ether C 356 2.6
Dimethyl hydrazine C 480 2.0
Ethane - C2H6 30.068 D 959 1639 20394 1.0488 0.0803 12.455
Ethyl Alcohol - C2H5OH 40.067 D 793 1450 11929 1.39
Ethyl Chloride - C2H5Cl 64 D 966 1504 8907 2.2
Ethylene - C2H4 28.052 C 842 1514 20298 1.5
Ethylene Oxide 44 B 804 1
n-Hexane - C6H14 86.169 D 502 4412 19403 2.97
Hydrogen - H2 2.016 B 1085 274.9 51605 0.0696 0.00533 187.723
Hydrogen Cyanide - HCN 27.010 C 1000 276 10220 0.93
Hydrogen Sulfide - H2S 34.076 C 500 596 6545 1.17
Methane - CH4 16.042 D 999 914.5 21537 0.5543 0.0425 23.852
Methyl Alcohol - CH3OH 32.041 D 876 768 9078 1.10
Methyl Chloride - CH3Cl 50.488 1170 766.5 5911 1.74
Methyl Disulfide - C2H6S2 94.20 2326 9359 3.25
Methyl Ether   C            
Methyl Mercaptan 49 C       1.7    
Methyl Sulfide - C2H6S 62.13 403 1975 12049 2.14
Napthalene - C10H8 128.16 D 979 5654 16708 4.42
Natural Gas 19.463 D 900 957 19800 0.67
Nitrogen - N2 28.016 - - - - 0.9718 0.0744 13.443
Octane 114 D 428 3.90
Octene   D            
Oxygen - O2 32 - - - - 1.1053 0.0846 11.819
Propane - C3H8 44.094 D 871 2372 19807 1.5617 0.1196 8.365
n-Pentane - C5H12 72.146 D 588 3900 20485 2.49
Isopentane - C5H12 72.146 D 788 3716 19478 2.49
Neopentane - C5H12 72.146 D 842 3603 19396 2.49
n-Pentene - C5H10 70.130 D 523 3750 20211 2.42
Propylene - C3H6 42.078 D 927 2233 20115 1.45
Propylene Oxide 58.1 B 840 2.0
Propyl Alcohol 61 D 700     2.1    
Isopropyl Acetate - C5H10O2 102.13 D 860 3017 11196 3.534 0.2695 3.711
Styrene 104 D 914     3.6    
Sulfur - S  * 32.06 - - - 3983 - - -
Sulfur Dioxide - SO2 64.06 - - - - 2.217 0.1690 5.9163
Toluene - C7H8 92.134 D 997 4550 18716 3.18
Turpentine   D 488          
Vinyl Chloride 64 D 882     2.2    
Water Vapor - H2O 18.016 - - - - 0.6234 0.0475 21.037
Xylene - C8H10 106.153 D 867 4980 17760 3.673 0.2801 3.570

Notes:  All gas volumes at 60 degr F and 30 inches Hg.

* -- Carbon and Sulfur are solids at these conditions.
** -- Butadiene shows characteristics of both Groups B & D gases -- SPECIAL.
*** -- Carbon Disulfide needs additional protection beyond its class due to very low ignition temperature.

 

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