It's certainly "do-able". Conformal coating adhesion testing was done as part of the "Evaluation of Low Residue Sodeirng for Military and Commercial Applications: A Report from the Low Residue Sodlering Task Force", report published by Sandia National Labs in June 1995. I would note however that the rankings did differ from process to process and it really depends on YOUR process (ie. flux, how much you add, solder process, etc) YOUR PWB incoming cleanliness (CRITICAL if you really are doing "no clean) YOUR end item use environment (does coating just have to "cure and stick" or do you do humidity exposure type testing??) 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: ASSY: Conformal Coating NoClean PWB's Author: [log in to unmask] at esdigate Date: 10/25/96 7:28 AM We are anticipating assembling a large quantity of pwb's which will require a polyurethane conformal coating. We would prefer to use a no-clean solder process but feel the residues will not permit the coating to adhere. Is anyone aware of products or procedures which would allow a pwb, which has been assembled with a no-clean process (sans cleaning), to be conformally coated? Anyone have any prior experience with this issue. Thanks for your time. Joe Wergers, Project Engineer Fawn Industries, Inc. Box 369 Elm City, NC 27822 Web Site: www.fawn-ind.com Email: [log in to unmask] *************************************************************************** * 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. * ***************************************************************************