# Is there any type of liquid, other than mercury, that PTFE teflon is known to “float” to the surface in?

The specific gravity of PTFE teflon is roughly 2.3. I have a 3/8" diameter sphere made up of entirely PTFE teflon, and I would like for it to float to the surface when dropped into a liquid.

Does anyone know of a liquid, other than mercury, that will allow this feat to be achievable?

(I prefer that the liquid be both non-toxic and inexpensive)

• Gallium as well, presumably. – Jon Custer Feb 10 '16 at 15:56
• en.wikipedia.org/wiki/Clerici_solution - unfortunately toxic and expensive. That aside, I know that caesium chloride is used for centrifugation purposes although I'm not sure what's the highest density it can reach (lazy to calculate it right now). – orthocresol Feb 10 '16 at 16:08
• Tetrabromomethane - Density: 3.42 g/cm³ – MaxW Feb 10 '16 at 16:41
• $\ce{CHBr3}$ or $\ce{CH2I2}$ would do as well. – Ivan Neretin Feb 10 '16 at 16:47
• I don't think cesium chloride is quite dense enough (in aqeeous solution). Cesium bromide might do the trick. – Curt F. Jun 25 '16 at 4:36

Various liquids are denser than $2.2\rm~\frac{g}{cm^3}$. $\ce{CBr2F2}$ is one of them with fairly low toxicity. Check out halons.