Depends on the cross linking system used in the coating. Older types using a acetic acid (acetoxy type) cure mechanism do pose some corrosive risk. Most manufacturers now also offer products based on Oxime cure mechanism that do not pose this risk. The later generally however have longer tackfree times. This is a common issue that comes up with Si coatings. I think is somewhat also based on silicone hand lotions causing solderability issues. As a results, any type of "silicone" products generally tends to cause concern. Rich Kraszewski / PLEXUS -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Mike Johnson Sent: Thursday, May 28, 2009 2:38 PM To: [log in to unmask] Subject: [TN] Conformal coating process We are a contract builder that manufactures printed circuit board assemblies and apply a silicone conformal coating to those assemblies. Our coating process is not isolated from the assembly and test area. We use a Sn63Pb37 solder process in both our smt and wave solder areas. This has been our process for at least the last 15 years. We are being told, by a potential customer, that we are risking silicone contamination of our solder joints as a result of our coating process being in close proximity to assembly and test. What are the risks to solder joint quality, if any? Thanks. --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 15.0 To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/archives Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 -------------------------------------------------- --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 15.0 To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/archives Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 -----------------------------------------------------