Never use Humiseal Type conformal coating remover.  This stuff is conductive and can become trapped under components causing problems. 
  ----- Original Message ----- 
  From: Dehoyos, Ramon<mailto:[log in to unmask]> 
  To: [log in to unmask]<mailto:[log in to unmask]> 
  Sent: Tuesday, December 13, 2005 10:35 AM
  Subject: Re: [TN] Help with removing UR Conformal Coating


          Hi Andrew:
                          Humiseal makes a UR stripper but it will remove all the coating vertically in significantly quicker time than horizontally. Under the BGAs it will remove it if the coating did not fill all the spacing under the BGA. If there is a complete fill of the spacing under the BGA, it is a different story because the horizontal distance is much greater. Perhaps damming the BGA and filling with the chemical may accomplish what you want. I would try it on a scrap board that is made of the same material. Cheers
          Regards,
          Ramón 

  -----Original Message-----
  From: TechNet [mailto:[log in to unmask]] On Behalf Of Joseph H. Smith
  Sent: Tuesday, December 13, 2005 9:48 AM
  To: [log in to unmask]<mailto:[log in to unmask]>
  Subject: [TN] Help with removing UR Conformal Coating

  Has anyone had experience or success with removing conformal coating for PWA that has been coated with UR coating especially using a chemical means.  I am particularly interested with how you handled coating around or under BGA's.

  Any help would be grateful.


  Thanks.

  Andrew Kettlewell
  Process Engineer
  Sypris Electronics
  Tampa, FL
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