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<p>[QUOTE=&quot;-jeffB, post: 2077638, member: 27832&quot;]For completeness, we should note that rags and newsprint are also combustible when they <i>aren&#039;t</i> soaked with acetone.</p><p><br /></p><p>Acetone will evaporate <i>very</i> quickly from these materials, but until it does, yes, they&#039;re very easy to ignite. Also, since it evaporates quickly from them, it&#039;ll make for a higher concentration of vapor (much higher than just an evaporating bowl of it), increasing the risk of ignition or narcosis. Don&#039;t just put them in a fire-safe trash can; put them <b>outside</b> in a fire-safe trash can.</p><p><br /></p><p>Acetone vapor, like most flammable vapors, is heavier than air. So if you&#039;ve got acetone-soaked rags, the vapor can creep across the floor, and if it finds an ignition source, fire will flash back along its path. This ignition source could be a refrigerator motor, or a pilot light on an appliance, or a static spark.</p><p><br /></p><p>One thing acetone <i>won&#039;t</i> do is start a spontaneous fire like oil-soaked rags. Rags soaked with some vegetable oils will slowly oxidize over time, building up heat, sometimes enough to start a fire. My in-laws had a serious garage fire start this way. Acetone and xylene won&#039;t heat up on their own when exposed to air; they need an ignition source.[/QUOTE]</p><p><br /></p>

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