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(Chemistry) chem a colourless gaseous hydrocarbon that is an isomer of butane and which is used as a fuel and a refrigerant. Formula: (CH3)3CH
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˌaɪ səˈbyu teɪn, -byuˈteɪn)

a colorless, flammable gas, C4H10, used as a fuel, a refrigerant, and in the manufacture of gasoline by alkylation.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
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Ice cream cabinets are one example of a light commercial unit that has widely adopted the use of natural refrigerants such as R-290 (propane) and R-600a (iso-butane), spurred by Unilever's decision in 2000 to implement a non-HFC purchasing policy by 2005.
Optimized for use with eco-friendly hydrocarbon refrigerants R-290 (propane) and R-600a (isobutane), the TC compressor delivers an efficiency up to 6.1 EER (1.78 COP).
Isobutane (R-600a) has dominated the European refrigerator/freezer sector for the past decade and is being used even in Japan and Korea, while propane (R-290) and propylene (R-1270) are used for heat-pumping applications in Europe (IEAHPC 2002).
ICOR Hot Shot R-414B, a blend of R-22, R-142B, R-124 and R-600A, is claimed to be 10% more efficient than R-12 and 30% more efficient than R-134A, while being completely compatible with systems using either of those refrigerants.
Refrigerators now are almost all built with compressors using R-134a (about two-thirds of the market) or R-600a, aka isobutane, which is almost universal in Europe and accounts for about one-third of the global market.
(2000) for mixtures of R-290 with R-600 and R-600A are overpredicted, especially with the Del Col et al.
Three synthetic polyolester (POE) oils of different viscosity grades (approximately 5, 7, and 10 cSt at 40[degrees]C, respectively) were combined with refrigerants R-134a and R-600a. In absorption of R-134a in lubricant oil, the liquid refrigerant is heavier than the oil, and the liquid flow field is a result of natural mass convection.
Moreover, they aren't toxic or flammable, like ammonia, nor do they pollute the atmosphere like ammonia ("induced effect") and R-600a (Isobutane, which reacts with other chemicals to produce smog, and is also flammable).
Refrigerants "Natural refrigerants (R-290, R-600a, C[O.sub.2])."
List of Refrigerants from Brown (2007) R-11 R-41 R-134a R-152a R-236fa R-600 R-12 R-123 R-141b R-170 R-245ca R-600a R-22 R-124 R-142b R-218 R-245fa R-1270 R-32 R-125 R-143a R-227ea R-290 R-C318 Table A2.
The AE2 supports traditional HFC refrigerants--R-134a and R-404A--and is also optimized for hydrocarbon refrigerants--R-290 (propane) and R-600a (isobutene).
Those compressors are suitable for many standard hydrocarbons such as R-290 (propane), R-600a (isobutane) and R-1270 (propylene).