coal mine, Designer III Blog most recent posts http://blog.designer-iii.com/coal_mine en Sat, 23 Jun 2007 13:28:05 GMT 200 Posted by Bob Paddock: (coal mine) A very common misconception is that Conformal Coating is a Hermetic Seal. It is used a lot in the Coal Mines, and the Electronic Industry in general, to keep the caustic dust off circuit boards. As Conformal Coating is not a hermetic seal, what real happens is the impurities in the water are kept away from the circuit, but the water itself<br>Tags: <b>conformal coating</b>, <b>hermetic seal</b>. Comments: 0. http://blog.designer-iii.com/conformal_coating/20070623-09285-Conformal-coating-is-not-a-Hermetic-Seal http://blog.designer-iii.com/conformal_coating/20070623-09285-Conformal-coating-is-not-a-Hermetic-Seal