Teflon

<p><b >Hydrofluoric acid (HF)</b>&nbsp;is a&nbsp;<a href="http://en.wikipedia.org/wiki/Solution" title="Solution" >solution</a>&nbsp;of&nbsp;<a href="http://en.wikipedia.org/wiki/Hydrogen_fluoride" title="Hydrogen fluoride" >hydrogen fluoride</a>&nbsp;in<a href="http://en.wikipedia.org/wiki/Water" title="Water" >water</a>. It is a valued source of&nbsp;<a href="http://en.wikipedia.org/wiki/Fluorine" title="Fluorine" >fluorine</a>&nbsp;and is a precursor to numerous pharmaceuticals such as&nbsp;<a href="http://en.wikipedia.org/wiki/Fluoxetine" title="Fluoxetine" >fluoxetine</a>&nbsp;(<a href="http://en.wikipedia.org/wiki/Prozac" title="Prozac" class="mw-redirect" >Prozac</a>) and diverse materials such as&nbsp;<a href="http://en.wikipedia.org/wiki/Polytetrafluoroethylene" title="Polytetrafluoroethylene" >PTFE</a>&nbsp;(Teflon).</p>