Isobutane (R600a)


Isobutane (R600a) is supplied as a liquid under its own vapour pressure in cylinders and in T50 ISO containers for international transport as well as road trailers and rail cars. It is widely used due to its low environmental impact and excellent thermodynamic performance and it is the refrigerant gas of choice in domestic and small commercial refrigerators outside of the USA. It also has applications as a heat transfer fluid in the geothermal industry.

Standard Specifications

(AGT International has multiple sources for isobutane, sample purities are shown below)

Purity / Assay
Impurities (mol)
IsoButane> 98%> 99.5%
n-Butane< 1.0%< 0.2%
Propane< 1.0%< 0.3%
Methane< 0.1%< 100ppm
Ethane< 0.1%< 100ppm
Isopentane< 0.1%< 10ppm
n-Pentane< 0.1%< 10ppm
Sulfur< 1ppm< 1ppm
Moisture< 10ppm< 10ppm

Standard Container Sizes and Fill Volumes

Container Information
TypeL454 Cylinder20' T50 ISO Container40' T50 ISO ContainerRoad Trailer

*Railcars also available (US only). Please contact us for details.

Technical Information

Technical DataShipping Information
Molecular Weight (g/mol)58.123Shipping NameIsobutane
Liquid Density (kg/m³)593.4Hazard Class2.1
Gas Density (kg/m³)2.51UN No.UN 1969
Boiling point (°C)-11.7Hazard LabelFlammable gas
Specific Volume (m³/kg)0.406CAS No.72-28-0
Vapour Pressure (bar.a @ 20°C)2.13
Valve OutletCylinder – CGA 510, T50 - ACME, MALE. 1 ¾” gas phase / 3 ¼” liquid phase