Morning Steve, You could try throwing the book at them. IPC-D-275, Par 5.5 Coatings and Markings "Coatings & markings shall be compatible with each other". Par 5.5.1 Solder Resist Coatings "Solder resist adhesion to melting metal surfaces (solder coating, tin/lead plating, etc.) cannot be assured as boards are subjected to temperatures that cause redistribution of the melting metals. ..............When solder resist is required over melting metals, the maximum recommended conductor width shall be 0.050". Regards, Mark PS..Par 5.5.1 contains additional info. -----Original Message----- From: Steve Gregory [SMTP:[log in to unmask]] Sent: Thursday, April 08, 2004 9:52 PM To: [log in to unmask] Subject: [TN] Solder Mask over Tin/Lead... Had a really frustrating conference call today. Our customer is standing firm that they will not change their drawings on their fabs that specify that everything needs to be coated with tin/lead before solder mask. Their arguement is that they've never had any problems before, so why should they change anything...and I percieved that they blamed our assembly processes for the mask adhesion issues that we were seeing. What do you do in a situation like this? I'm trying to gather as much information as I can that shows that anything other than SMOBC is risky, but during the conference call, anything that I tried to say was dismissed...because they say that they've been doing this for years, and this is the first time that they have heard from any of their subcontractors that there is a problem. I suppose that there won't be any good answers for this, we'll have to deal with this the best that we can. Sure makes life interesting...the customer is always right, and we're all about customer satisfaction. -Steve Gregory- --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 1.8e 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 847-509-9700 ext.5315 ----------------------------------------------------- --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 1.8e 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 847-509-9700 ext.5315 -----------------------------------------------------