Material Safety Data Sheet

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Part.9 Physical And Chemical Properties
Items
Isobutane
Molecular Weight 58.124
Normal Melting Point (in air and at 101.3kPa), K 113.55
Normal Boiling Point (at 101.3kPa), K 261.43
Explosion Limit (at 293.15K and 101.3kPa, in air), %(V)
1.8~8.4
(at 293.15K and 101.3kPa, in oxygen), %(V)
1.8~40
Auto ignition Temperature (at 101.3kPa and in air), K
735.15
Flash Point, K
190
Net Combustion Heat
(real gas, at 288.7K and 101.3kPa), kJ/mol
2645
(liquid, at its saturation pressure and 298.15K), kJ/mol
2627
6Hof (ideal gas, at 298.15K), kJ/mol -134.51
(liquid, at 298.15K), kJ/mol -158.4
6Gof (at 298.15K and 101.3kPa), kJ/mol
-20.88
Heat of Melting, kJ/mol 4.540
Heat of Evaporation (at normal boiling point), kJ/mol
21.30
Density (gas, at 288.7K and 101.3kPa), kg/m
3
2.5285
Density (liquid, at its saturation pressure and 298.15K), kg/m
3
551.0
Critical Points
Pressure, MPa
3.648
Temperature, K
408.13
Density, kg/m
3
221.0
Volume, cm
3
/mol
263
Compressibility Factor
0.283
SO(ideal gas, at 298.15K), J/mol·K
295.4
Cpo(ideal gas, at 288.7K), J/mol·K
94.16
(ideal gas, at 298.15K), J/mo)·K
96.65
Cpo/Cvo(ideal gas, at 288.7K)
1.097
Cv
o
(ideal gas, at 288.7K), J/mol·K
85.85
Cpo(liquid, at 288.7K and 101.3kPa), J/mol·K
138.5
Surface Tension (at saturation pressure and 223.15K), mN/m (=dyn/cm) 18.7
(at saturation pressure and 273.15K), mN/m (=dyn/cm) 130
Refractive Index, n0
25
(liquid, at saturation pressure)
1.3508