Tan It is not a reaction with the Solithane coating that I would worry about, it is the possibly harmful effects from the residues of the mask on the actual circuit performance - exacerbated by the presence of a hydrophilic coating. Graham Naisbitt On 1 Jul 2008, at 13:02, Tan Geok Ang wrote: > I do agreed different chemicals react differently between them, so > far the peelable that we are doing does not react with Solithane > 113/113-300. Thank for the advice which is always a point to consider. > > ________________________________ > > From: TechNet on behalf of Graham Naisbitt > Sent: Tue 7/1/2008 5:54 PM > To: [log in to unmask] > Subject: Re: [TN] Solithane coating dewetting > > > > Tan > > Be careful - peelable masks often contain ingredients that remain > behind after removal and that can lead to unfavorable reactions. > > Graham Naisbitt > > > On 27 Jun 2008, at 07:46, Tan Geok Ang wrote: > >> Currently, I will apply some peelable mask over those "problematic" >> IC >> moulding, the dewetting is minimised. Just want to find out the >> cause of >> the problem. Thank for the advice! >> >> -----Original Message----- >> From: TechNet [mailto:[log in to unmask]] On Behalf Of Whittaker, Dewey >> (EHCOE) >> Sent: Thursday, 26 June 2008 10:10 PM >> To: [log in to unmask] >> Subject: Re: [TN] Solithane coating dewetting >> >> I agree with Doug, especially the part about somewhat agreeing with >> Graham (just kidding). Since these are the daze of outsourcing, I >> have >> had to give relief on the coverage requirement for non-conductive, >> non-critical surface areas of plastic parts due to the aforementioned >> reasons. >> Dewey >> >> -----Original Message----- >> From: TechNet [mailto:[log in to unmask]] On Behalf Of Douglas O. Pauls >> Sent: Thursday, June 26, 2008 5:30 AM >> To: [log in to unmask] >> Subject: Re: [TN] Solithane coating dewetting >> >> I somewhat agree with Graham. Nothing really likes to stick to >> silicones, >> including other silicones. I often have to address the challenge of >> conformal coating delaminating over a spot where RTV silicones had >> been >> dripped and then wiped up. >> >> I would suggest plasma etching, most likely oxygen and argon. A >> fairly >> short duration is often effective at solving coating adhesion issues >> in >> problem cases. Many of the mold release agents are either teflon or >> silicone based, so will be fairly chemically resistant. That is why >> the >> >> Ensolv may not be addressing it. >> >> Where I disagree with Graham is the approach of having the component >> manufacturer change their most release agent. If you are a Motorola >> or a >> >> Nokia, and going through a few million components a day, you might >> have >> a >> little leverage with the component manufacturer. Most of us just >> have >> to >> take what we can get and don't have the leverage necessary to get >> changes >> made. >> >> Doug Pauls >> Rockwell Collins >> >> >> >> >> Graham Naisbitt <[log in to unmask]> >> Sent by: TechNet <[log in to unmask]> >> 06/26/2008 06:05 AM >> Please respond to >> TechNet E-Mail Forum <[log in to unmask]>; Please respond to >> Graham Naisbitt <[log in to unmask]> >> >> >> To >> [log in to unmask] >> cc >> >> Subject >> Re: [TN] Solithane coating dewetting >> >> >> >> >> >> >> Silicone not sticking to silicone - no surprise. >> >> How to remove silicone? Not easy, maybe plasma etching or a really >> aggressive solvent. >> >> You need to get back to the component manufacturer and have them >> change their mold release or at least control how much they use. >> >> Graham Naisbitt >> >> On 26 Jun 2008, at 07:33, Tan Geok Ang wrote: >> >>> Hi All, >>> Quite often, I encountered Solithane coating dewetting >> issue >>> over some IC moulding (rough or smooth, did not trace what moulding >>> material is used) compounds across different suppliers, though the >>> whole >>> PCBAs are being cleaned with EnSolv. What is the cause of the issue? >>> Is >>> the cause due to the release agent used during the moulding compound >>> process (but why cannot be clean away)? >>> Thank in advance! >>> Regards >>> GA Tan >>> >>> --------------------------------------------------- >>> 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 >>> 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