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August 2006

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Subject:
From:
Edward Mines <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Edward Mines <[log in to unmask]>
Date:
Thu, 24 Aug 2006 09:31:22 -0700
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I have to disagree with the assertion that water is the best solvent for cleaning PC boards.

  It may be good for many (or even most no clean fluxes) but water alone will not touch various greases and oils including finger prints. Have you ever tried to clean you hands
  with water alone after changing the oil in your car?

  I don't know the legal consequences of using traditional vapor cleaning equipment or the current availability of effective vapor cleaning solvents, but I do know that vapor cleaning with trichlor was very effective when it was the industry standard. Other solvents will work too.

  It is important to remove all oily residues (finger prints, mold release agents etc) from PC boards prior to conformal coating - otherwise incomplete coverage can take place.
  Both MIL-I-46058 & IPC-CC-830 state that conformal coatings should be free from voids, skips and other breaks in the coating.

  Ed Mines


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