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Reference.org
Perfluorobutane
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<p>Perfluorobutane (PFB) is an inert, high-density colorless gas. It is a simple <a href="/facts/Fluorocarbon/jA9N6aoT">fluorocarbon</a> with a <a href="/facts/Butane/InIHpYlY"><i>n</i>-butane</a> skeleton and all the <a href="/facts/Hydrogen/BoYHjl0J">hydrogen</a> atoms replaced with <a href="/facts/Fluorine/YUV0Fb8m">fluorine</a> atoms. </p>