Two comments, a) Dewetting of coating is generally caused by the surface not being clean enough/residue. We use a variety of UR type coatings on plastic devices and don't have a wetting issue. You may want to investigate the cause /correct the process. b) For hardware already coated, I would suggest that dewetted areas that don't reduce the electrical spacing between non-common conductors to less than the design limit (ie. electrical spacing required as a function typically of voltage differntial) should not be reworked. See ANSI/J-STD-001B section 10.1.2.2 for some additional insites. Jim Maguire Senior Principal Engineer Boeing Defense & Space Group PO Box 3999 M/S 3W-97 Seattle, WA 98124-2499 Phone 206-657-9063 FAX 206-657-8903 Email: [log in to unmask] ______________________________ Reply Separator _________________________________ Subject: FWD: pwb-cca : conformal coating Author: [log in to unmask] at esdigate Date: 10/23/96 4:37 AM Technet, I'm forwarding this from a colleague. Cindy Kemp Lockheed Martin Orlando, FL ******************************************************************************* From: [log in to unmask] Date: Tue, 22 Oct 96 16:35:22 EDT Message-Id: <[log in to unmask]> To: [log in to unmask] Subject: pwb-cca : conformal coating Sender: [log in to unmask] Precedence: bulk hi group; We are finding that in designs using conformal coating (UR) over plastic parts that the cc is dewetting on the parts. Question - is this seen as a problem ? I am proposing that a note should be added to our designs as follows: CONFORMAL COAT DEWETTING ON PLASTIC ENCAPSULATED MICROCIRCUIT COMPONENT BODY IS ACCEPTABLE. If there is a better way please let me here from you. What is the real would doing ? thanx; Skip Greb ======================================================================== To learn more about this email exploder (majordomo), including how to unsubscribe from this list, send e-mail to: [log in to unmask] and place the command "help" in the body of the message - subject may be left blank. Help can also be obtained on the WWW at http://www.epic.lmco.com/Majordomo ======================================================================== *************************************************************************** * TechNet mail list is provided as a service by IPC using SmartList v3.05 * *************************************************************************** * To unsubscribe from this list at any time, send a message to: * * [log in to unmask] with <subject: unsubscribe> and no text. * *************************************************************************** *************************************************************************** * TechNet mail list is provided as a service by IPC using SmartList v3.05 * *************************************************************************** * To unsubscribe from this list at any time, send a message to: * * [log in to unmask] with <subject: unsubscribe> and no text. * ***************************************************************************