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184.1165 n-Butane and iso-butane.
（a n -Butane and iso-butane （empirical formula C4H10, CAS Reg. Nos. 106C97C8 and 75C28C5, respectively are colorless, odorless, flammable gases at normal temperatures and pressures. They are easily liquefied under pressure at room temperature and are stored and shipped in the liquid state. The butanes are obtained from natural gas by fractionation following absorption in oil, adsorption to surface-active agents, or refrigeration.
（b The ingredients must be of a purity suitable for their intended use.
（c In accordance with184.1（b）（1? these ingredients are used in food with no limitations other than current good manufacturing practice. The affirmation of these ingredients as generally recognized as safe （GRAS as direct human food ingredients is based upon the following current good manufacturing practice conditions of use:
? The ingredients are used as propellants, aerating agents, and gases as defined in170.3（o）（25 of this chapter.
? The ingredients are used in food at levels not to exceedcurrent good manufacturing practice.
（d Prior sanctions for these ingredients different from the uses established in this section do not exist or have been waived.
[48 FR 57270, Dec. 29, 1983, as amended at 73 FR 8607, Feb. 14, 2008]
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