Isobutane - Bulk


Isobutane is produced by isomerization of n-Butane. n-Butane is separated from a natural gas stream by absorption in a light oil. It is then stripped along with propane as liquefied petroleum gas (LPG) and  separated by fractional distillation: n-butane boils at -0.5° C (31.1° F); isobutane boils at -11.7° C (10.9° F).

It is filled into T50 ISO containers for international transport as well as road trailers and rail cars. ISO Containers are approved by UN, RID/ADR, CSC, AAR-600, DOT, TC, TIR, UIC.

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
Type20' T50 ISO Container30' 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 OutletACME, MALE. 1 ¾” gas phase / 3 ¼” liquid phase.