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Spacecraft Maximum Allowable Concentrations for Selected Airborne Contaminants, Volume 5
TABLE 6-1 Physical and Chemical Properties of C2-C9 n-Alkanes
C2
C3
C4
C5
C6
C7
C8
C9
Formula
C2H6
C3H8
C4H10
C5H12
C6H14
C7H16
C8H18
C9H20
Name
Ethane
Propane
Butane
Pentane
Hexane
Heptane
Octane
Nonane
CAS registry no.
78-84-0
74-98-6
106-97-8
109-66-0
110-54-3
142-82-5
111-65-9
111-84-2
Molecular weight
30.1
44.1
58.1
72.1
86.1
100.2
114.2
128.3
Boiling point (°C)
−88.6
−42.1
−0.5
36.1
69
98.4
125.7
150.8
Lower explosive limit
3.2%
2.3%
1.9%
1.4%
1.2%
1.2%
1.0%
0.9%
Upper explosive limit
12.5%
9.5%
8.4%
7.8%
7.8%
6.7%
4.7%
2.9%
Vapor pressure (mm Hg)
Gas
Gas
Gas
400 (18°C)
100 (20°C)
40 (25°C)
10 (19°C)
10 (38°C)
Conversion factor (ppm to mg/m3) 25°C
1.23
1.80
2.38
2.95
3.52
4.10
4.67
5.25
Isomers
1
1
2
3
5
9
18
33
Abbreviations: mg/m3, milligrams per cubic meter; ppm, parts per million.
