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<p>blends of pure, dry "isobutane" (R-600a) (that is, isobutane mixtures) have negligible <a href="page.php?w=ozone_depletion_potential">ozone depletion potential</a> and very low <a href="page.php?w=global_warming_potential">global warming potential</a> (having a value of 3.3 times the GWP of carbon dioxide) and can serve as a functional replacement for <a href="page.php?w=dichlorodifluoromethane">R-12</a>, <a href="page.php?w=chlorodifluoromethane">R-22</a> (both of these being commonly known by the trademark <a href="page.php?w=Freon">Freon</a>),</p><p>
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