CONCOA Precision Gas Controls

Isobutane CH(CH3)3
DESCRIPTION (Isobutane):


Isobutane is a colorless, flammable gas. It is shipped as a liquefied gas under it's own vapor pressure of approximately 30.7 psig @ 70° F. Typically used in the manufacture of aviation fuels and as a calibration gas for temperature and pressure gauges.

PHYSICAL CONSTANTS (Isobutane):

Molecular Weight: 58.124
Vapor Pressure @ 70° F.: 30.7 psig
Specific Volume @ 70° F., 1 atm.: 6.5 cu.ft/lb
Boiling Point @ 1.0 atm. : 10.9° F
Freezing Point @ 1 atm. : -255.3° F
Specific Gravity, Gas @ 60° F., 1 atm. (Air = 1): 2.01
Density, Liquid @ 60° F., 1 atm.: 0.563 g/ml
Critical Temperature: 275.0° F
Critical Pressure: 529.2 psia
Critical Density: 0.221 g/ml
Latent Heat of Vaporization @ b.p.: 87.56 cal/g
Latent Heat of Fusion @ m.p.: 18.67 cal/g
Flammable Limits in Air: 1.8-8.4% by volume
Autoignition Temperature: 1010° F
Gross Heat of Combustion @ 60° F., 1 atm. 3352.15 BTU/ft3
Specific Heat, Liquid @ 60° F., 1 atm. Cp: 0.5695 cal/(g)(° C)
Specific Heat, Gas @ 60° F., 1 atm. Cp: 0.3872 cal/(g)(° C)
Specific Heat, Gas @ 60° F., 1 atm. Cv: 0.3530 cal/(g)(° C)
Specific Heat Ratio, Gas @ 60° F., 1 atm., Cp/Cv: 1.097
Thermal Conductivity, Gas @ 0° C. : 0.01169 BTU/hr ft2 ° F/ft
Viscosity, Gas @ 23° C., 1 atm. : 0.00755 centipoise
Surface Tension @ -20° C., 1 atm. : 15.28 dynes/cm
Solubility in Water @ 17° C., 1 atm. : 1.7 cc/ 100 cc H2O

CYLINDER CONNECTIONS (Isobutane):

Standard CGA V-1 Cylinder Connection CGA 510